Yamaha Outboard Motor 99 15 User Manual

9.9  
15  
OWNER’S MANUAL  
Read this manual carefully before operating this  
outboard motor.  
U.S.A.Edition  
LIT-18626-08-34  
63V-28199-1E  
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ZMU01690  
Read this manual carefully before operating this outboard motor. Keep this  
manual onboard in a waterproof bag when boating. This manual should stay  
with the outboard motor if it is sold.  
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Important manual information  
EMU31283  
your machine and this manual. If there is any  
question concerning this manual, please con-  
To the owner  
Thank you for choosing a Yamaha outboard  
motor. This Owner’s Manual contains infor-  
mation needed for proper operation, mainte-  
nance and care. A thorough understanding of  
these simple instructions will help you obtain  
maximum enjoyment from your new Yamaha.  
If you have any question about the operation  
or maintenance of your outboard motor,  
please consult a Yamaha dealer.  
sult your Yamaha dealer.  
TIP:  
The 9.9MH, 15MH and the standard accesso-  
ries are used as a base for the explanations  
and illustrations in this manual. Therefore  
some items may not apply to every model.  
EMU25111  
9.9, 15  
OWNERS MANUAL  
©2009 by Yamaha Motor Corporation,  
USA  
In this Owner’s Manual particularly important  
information is distinguished in the following  
ways.  
1st edition, February 2009  
All rights reserved.  
: This is the safety alert symbol. It is used  
to alert you to potential personal injury haz-  
ards. Obey all safety messages that follow  
this symbol to avoid possible injury or death.  
EWM00781  
Any reprinting or unauthorized use  
without the written permission of  
Yamaha Motor Corporation, USA  
is expressly prohibited.  
Printed in Japan  
WARNING  
P/N LIT-18626-08-34  
A WARNING indicates a hazardous situa-  
tion which, if not avoided, could result in  
death or serious injury.  
ECM00701  
NOTICE  
A NOTICE indicates special precautions  
that must be taken to avoid damage to the  
outboard motor or other property.  
TIP:  
A TIP provides key information to make pro-  
cedures easier or clearer.  
Yamaha continually seeks advancements in  
product design and quality. Therefore, while  
this manual contains the most current product  
information available at the time of printing,  
there may be minor discrepancies between  
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Passengers ........................................ 2  
Avoid collisions................................... 2  
Basic boating rules  
Steering and sailing rules and sound  
General information ..........................8  
Identification numbers record.......... 8  
Outboard motor serial number ........... 8  
Read manuals and labels................ 9  
Warning labels.................................... 9  
Specifications and  
Emission control information......... 16  
Fuel tank........................................... 17  
Engine shut-off cord (lanyard)  
Manual starter handle....................... 20  
Steering friction adjuster................... 20  
Trim rod (tilt pin) ............................... 21  
Tilt lock mechanism.......................... 21  
Tilt support bar ................................. 21  
Cowling lock lever(s) (turn type)....... 22  
Carrying handle................................ 22  
Installation....................................... 23  
Installation..................................... 23  
Mounting the outboard motor ........... 23  
Clamping the outboard motor........... 24  
requirements....................................12  
Specifications................................ 12  
Installation requirements............... 13  
Boat horsepower rating .................... 13  
Mounting motor ................................ 13  
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Checks after starting engine ......... 33  
Cooling water ................................... 33  
Checks after engine warm-up ....... 33  
Shifting ............................................. 33  
Stop switches ................................... 34  
Stopping boat................................ 35  
Trimming outboard motor.............. 35  
Adjusting trim angle for manual tilt  
Removing propeller .......................... 50  
Installing propeller ............................ 50  
Changing gear oil ............................. 51  
Cleaning fuel tank............................. 52  
Inspecting and replacing anode(s) ... 53  
Trouble Recovery............................ 54  
Troubleshooting ............................ 54  
Temporary action in emergency ... 57  
Impact damage................................. 57  
Starter will not operate ..................... 57  
Emergency starting engine............... 58  
models .......................................... 36  
Adjusting boat trim............................ 36  
Tilting up and down....................... 37  
Procedure for tilting up  
(manual tilt models)....................... 38  
Procedure for tilting down  
(manual tilt models)....................... 38  
Shallow water................................ 39  
Cruising in shallow water  
(manual tilt models)....................... 39  
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Consumer information....................60  
YAMAHA MOTOR  
CORPORATION, U.S.A.  
OUTBOARD MOTOR  
TWO YEAR LIMITED  
WARRANTY............................... 60  
IMPORTANT WARRANTY  
INFORMATION IF YOU USE  
YOUR YAMAHA OUTSIDE  
THE USA OR CANADA ............. 63  
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Safety information  
EMU33622Outboard motor safety  
running away under power and leaving peo-  
ple stranded, or running over people or ob-  
jects.  
Observe these precautions at all times.  
EPMrUo36p501eller  
Always attach the engine shut-off cord to a  
secure place on your clothing or your arm or  
leg while operating. Do not remove it to leave  
the helm while the boat is moving. Do not at-  
tach the cord to clothing that could tear loose,  
or route the cord where it could become en-  
tangled, preventing it from functioning.  
Do not route the cord where it is likely to be  
accidentally pulled out. If the cord is pulled  
during operation, the engine will shut off and  
you will lose most steering control. The boat  
could slow rapidly, throwing people and ob-  
People can be injured or killed if they come in  
contact with the propeller. The propeller can  
keep moving even when the motor is in neu-  
tral, and sharp edges of the propeller can cut  
even when stationary.  
G Stop the engine when a person is in the wa-  
ter near you.  
G Keep people out of reach of the propeller,  
even when the engine is off.  
ERMoU3t3a630ting parts  
Hands, feet, hair, jewelry, clothing, PFD  
straps, etc. can become entangled with inter-  
nal rotating parts of the engine, resulting in se-  
rious injury or death.  
Keep the top cowling in place whenever pos-  
sible. Do not remove or replace the cowling  
with the engine running.  
jects forward.  
EMU33810  
Gasoline  
Gasoline and its vapors are highly flam-  
mable and explosive. Always, refuel accord-  
ing to the procedure on page 30 to reduce the  
risk of fire and explosion.  
EMU33820  
Only operate the engine with the cowling re-  
moved according to the specific instructions in  
the manual. Keep hands, feet, hair, jewelry,  
clothing, PFD straps, etc. away from any ex-  
posed moving parts.  
Gasoline exposure and spills  
Take care not to spill gasoline. If gasoline  
spills, wipe it up immediately with dry rags.  
Dispose of rags properly.  
If any gasoline spills onto your skin, immedi-  
ately wash with soap and water. Change  
clothing if gasoline spills on it.  
If you swallow gasoline, inhale a lot of gaso-  
line vapor, or get gasoline in your eyes, get  
immediate medical attention. Never siphon  
fuel by mouth.  
ECMaU3r3b900on monoxide  
This product emits exhaust gases which con-  
tain carbon monoxide, a colorless, odorless  
gas which may cause brain damage or death  
when inhaled. Symptoms include nausea,  
dizziness, and drowsiness. Keep cockpit and  
cabin areas well ventilated. Avoid blocking ex-  
haust outlets.  
EHMoU3t364p0arts  
During and after operation, engine parts are  
hot enough to cause burns. Avoid touching  
any parts under the top cowling until the en-  
gine has cooled.  
EEMlUe33c65t0ric shock  
Do not touch any electrical parts while starting  
or operating the engine. They can cause  
shock or electrocution.  
EEMnU3g36i7n1 e shut-off cord (lanyard)  
Attach the engine shut-off cord so that the en-  
gine stops if the operator falls overboard or  
leaves the helm. This prevents the boat from  
1
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Safety information  
EMU33780  
and when operating above an idle speed.  
Standing or sitting in non-designated loca-  
tions may result in being thrown either over-  
board or within the boat due to waves, wakes,  
or sudden changes in speed or direction.  
Even when people are positioned properly,  
alert your passengers if you must make any  
unusual maneuver. Always avoid jumping  
Modifications  
Do not attempt to modify this outboard motor.  
Modifications to your outboard motor may re-  
duce safety and reliability, and render the out-  
board unsafe or illegal to use.  
EMU33740  
Boating safety  
This section includes a few of the many im-  
portant safety precautions that you should fol-  
low when boating.  
EAMlUc33o71h0 ol and drugs  
Never operate after drinking alcohol or taking  
drugs. Intoxication is one of the most common  
factors contributing to boating fatalities.  
EPMeU3r3s72o0 nal flotation devices  
Have an approved personal flotation device  
(PFD) on board for every occupant. Yamaha  
recommends that you must wear a PFD  
whenever boating. At a minimum, children  
and non-swimmers should always wear  
PFDs, and everyone should wear PFDs when  
there are potentially hazardous boating condi-  
tions.  
waves or wakes.  
EMU33760  
Overloading  
Do not overload the boat. Consult the boat ca-  
pacity plate or boat manufacturer for maxi-  
mum weight and number of passengers. Be  
sure that weight is properly distributed ac-  
cording to the boat manufacturers instruc-  
tions. Overloading or incorrect weight  
distribution can compromise the boats han-  
dling and lead to an accident, capsizing or  
swamping.  
EAMvU3o37i7d2 collisions  
Scan constantly for people, objects, and other  
boats. Be alert for conditions that limit your  
visibility or block your vision of others.  
EPMeU3o37p31le in the water  
Always watch carefully for people in the wa-  
ter, such as swimmers, skiers, or divers,  
whenever the engine is running. When some-  
one is in the water near the boat, shift into  
neutral and stop the engine.  
Stay away from swimming areas. Swimmers  
can be hard to see.  
ZMU06025  
The propeller can keep moving even when  
the motor is in neutral. Stop the engine when  
a person is in the water near you.  
EPMaU3s37s51engers  
Operate defensively at safe speeds and keep  
a safe distance away from people, objects,  
and other boats.  
Consult your boat manufacturers instructions  
for details about appropriate passenger loca-  
tions in your boat and be sure all passengers  
are positioned properly before accelerating  
G Do not follow directly behind other boats or  
waterskiers.  
2
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Safety information  
G Avoid sharp turns or other maneuvers that You may also want to consider an Internet-  
make it hard for others to avoid you or un- based program for basic boater education.  
derstand where you are going.  
G Avoid areas with submerged objects or by the BoatU.S. Foundation, is approved by  
shallow water. the National Association of State Boating Law  
The Online Boating Safety Course provided  
G Ride within your limits and avoid aggressive Administrators (NASBLA) and recognized by  
maneuvers to reduce the risk of loss of con- the United States Coast Guard. Most, but not  
trol, ejection, and collision.  
all, states accept this course to meet their  
G Take early action to avoid collisions. Re- minimum requirements. While it cannot re-  
member, boats do not have brakes, and place an in-depth course such as one offered  
stopping the engine or reducing throttle can by the U.S. Coast Guard, U.S. Power Squad-  
reduce the ability to steer. If you are not ron, or other organization, this online course  
sure that you can stop in time before hitting does provide a general overview of the basics  
an obstacle, apply throttle and turn in anoth- in boating safety, requirements, navigation,  
er direction.  
and operation. Upon successful completion of  
the course, the user can download a certifi-  
cate of completion immediately or, for a small  
charge, request one by mail. To take this free  
course, go to boatus.org.  
EPMaU3s38s80enger training  
Make sure at least one other passenger is  
trained to operate the boat in the event of an  
emergency.  
EMU33790  
Weather  
Stay informed about the weather. Check  
weather forecasts before boating. Avoid boat-  
ing in hazardous weather.  
EAMcU3c38i0d0 ent reporting  
Boat operators are required by law to file a  
Boating Accident Report with their state boat-  
ing law enforcement agency if their boat is in-  
volved in any of the following accidents:  
EBMoU3a38t90ing safety publications  
1. There is loss of life or probable loss of life. Be informed about boating safety. Additional  
2. There is personal injury that requires publications and information can be obtained  
medical attention beyond first aid.  
3. There is property damage to boats or oth-  
er property over a certain amount.  
4. There is complete loss of a boat.  
Contact local law enforcement personnel if a  
report is necessary.  
from many boating organizations.  
EMU33590  
Laws and regulations  
Know the marine laws and regulations where  
you will be boating- and obey them. Several  
sets of rules prevail according to geographic  
location, but all are basically the same as the  
International Rules of the Road. The rules  
EBMoU3a38t70education and training  
Operators should take a boating safety presented in the following section are con-  
course. This may be required in your state. densed- and have been provided for your  
Many of the organizations listed in the next convenience only.  
section can provide information about cours-  
es in your area.  
3
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Safety information  
Contact the U.S. Coast Guard, the National www.nmma.org  
Association of State Boating Law Administra-  
tors, or your local Power Squadron for a com- Marine Retailers Association of America  
plete set of rules governing the waters in 155 N. Michigan Ave. Chicago,  
which you will be using your boat.  
IL 60304  
EMU33681 Boating organizations  
The following organizations provide boating  
safety training and information about boating EMBU33a690sic boating rules (Rules of  
safety and laws.  
the road)  
Just as there are rules that apply when you  
United States Coast Guard  
Consumer Affairs Staff (G-BC)  
Office of Boating, Public, and Consumer Af-  
fairs  
U.S. Coast Guard Headquarters  
Washington, D.C. 20593-0001  
Boating Safety Hotline: 1-800-368-5647  
are driving on streets and highways, there are  
waterway rules that apply when you are driv-  
ing your boat. These rules are used interna-  
tionally. (For USA: and are also enforced by  
the United States Coast Guard and local  
agencies.) You should be aware of these  
rules, and follow them whenever you encoun-  
ter another vessel on the water.  
ESMtUe33e70r0ing and sailing rules and sound  
signals  
Whenever two vessels on the water meet one  
another, one vessel has the right-of-way; it is  
called the stand-onvessel. The vessel that  
does not have the right-of-way is called the  
give-wayor burdenedvessel. These rules  
determine which vessel has the right-of-way,  
and what each vessel should do.  
United States Power Squadrons  
1-888-FOR-USPS (1-888-367-8777)  
Boat Owners Association of The United  
States  
1-800-336-BOAT (1-800-336-2628)  
National Association of State Boating Law  
Administrators (NASBLA)  
1500 Leestown Road, Suite 330  
Lexington, KY 40511 859-225-9497  
Stand-on vessel  
The vessel with the right-of-way has the duty  
to continue its course and speed, except to  
avoid an immediate collision. When you main-  
tain your direction and speed, the other vessel  
will be able to determine how best to avoid  
you.  
National Marine Manufacturers Associa-  
tion (NMMA)  
200 East Randolph Drive  
Suite 5100  
Chicago, IL 60601  
Give-way vessel  
The vessel that does not have the right-of-  
way has the duty to take positive and timely  
action to stay out of the way of the Stand-On  
4
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Safety information  
vessel. Normally, you should not cross in front  
of the vessel with the right-of-way. You should  
slow down or change directions briefly and  
pass behind the other vessel. You should al-  
ways move in such a way that the operator of  
the other vessel can see what you are doing.  
The general prudential rule ”  
This rule is called Rule 2 in the International  
Rules and says,  
In obeying and construing these rules due  
regard shall be had to all dangers of naviga-  
tion and collision, and to any special circum-  
stances, which may render a departure from  
the above rules necessary in order to avoid  
immediate danger.”  
In other words, follow the standard rules ex-  
cept when a collision will occur unless both  
vessels try to avoid each other. If that is the  
case, both vessels become Give-Way ves-  
sels.  
Meeting  
If you are meeting another power vessel head  
on, and are close enough to run the risk of col-  
lision, neither of you has the right-of-way Both  
of you should alter course to avoid an acci-  
dent. You should keep the other vessel on  
your port (left) side. This rule doesnt apply if  
both of you will clear one another if you con-  
tinue on your set course and speed.  
ERMuU2l5e52s1 when encountering vessels  
There are three main situations that you may  
encounter with other vessels which could lead  
to a collision unless the Steering Rules are fol-  
lowed:  
Meeting: (you are approaching another ves-  
sel head-on)  
Crossing: (you are traveling across the other  
vessels path)  
Overtaking: (you are passing or being  
passed by another vessel)  
Crossing  
When two power driven vessels are crossing  
each others path close enough to run the risk  
of collision, the vessel which has the other on  
the starboard (right) side must keep out of the  
way of the other. If the other vessel is on your  
right, you must keep out of its way; you are the  
Give-Way vessel. If the other vessel is on  
your port (left) side, remember that you  
should maintain course and direction, provid-  
ed the other vessel gives you the right-of-way  
as it should.  
In the following illustration, your boat is in the  
center. You should give the right-of-way to  
any vessels shown in white area (you are the  
Give-Way vessel). Any vessels in the shaded  
area must yield to you (they are the Give-Way  
vessels). Both you and the meeting vessel  
must alter course to avoid each other.  
5
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Safety information  
Fishing vessel right-of-way  
All vessels that are fishing with nets, lines or  
trawls are considered to be fishing vessels”  
under the International Rules. Vessels with  
trolling lines are not considered fishing ves-  
sels. Fishing vessels have the right-of-way re-  
gardless of position. Fishing vessels cannot,  
however, impede the passage of other ves-  
sels in narrow channels.  
Sailing vessel right-of-way  
Sailing vessels should normally be given the  
right-of-way. The exceptions to this are:  
1. When the sailing vessel is overtaking the  
power-driven vessel, the power-driven  
vessel has the right-of-way.  
2. Sailing vessels should keep clear of any  
fishing vessel.  
3. In a narrow channel, a sailing vessel  
should not hamper the safe passage of a  
power-driven vessel that can navigate  
only in such a channel.  
Reading buoys and other markers  
The waters of the United States are marked  
for safe navigation by the lateral system of  
buoyage. Simply put, buoys and markers  
have an arrangement of shapes, colors, num-  
bers and lights to show which side of the buoy  
a boater should pass on when navigating in a  
particular direction. The markings on these  
buoys are oriented from the perspective of be-  
ing entered from seaward (the boater is going  
towards the port). This means that red buoys  
are passed on the starboard (right) side when  
proceeding from open water into port, and  
black buoys are to port (left) side. When navi-  
gating out of port, your position with respect to  
the buoys should be reversed; red buoys  
should be to port and black buoys to star-  
board.  
Overtaking  
If you are passing another vessel, you are the  
Give-Wayvessel. This means that the other  
vessel is expected to maintain its course and  
speed. You must stay out of its way until you  
are clear of it. Likewise, if another vessel is  
passing you, you should maintain your speed  
and direction so that the other vessel can  
steer itself around you.  
EMU25531  
Other special situations  
There are three other rules you should be  
aware of when driving your boat around other  
vessels.  
Narrow channels and bends  
When navigating in narrow channels, you  
should keep to the right when it is safe and  
practical to do so. If the operator of a power-  
driven vessel is preparing to go around a  
bend that may obstruct the view of other water  
vessels, the operator should sound a pro-  
longed blast on the whistle (4 to 6 seconds). If  
another vessel is around the bend, it too  
should sound the whistle. Even if no reply is  
heard, however, the vessel should still pro-  
ceed around the bend with caution. If you nav-  
igate such waters with your boat, you will  
need to carry a portable air horn, available  
from local marine supply stores.  
6
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Safety information  
Many bodies of water used by boaters are en- white with black letters and orange boarders.  
tirely within the boundaries of a particular They signify speed zones, restricted areas,  
state. The Uniform State Waterway Marking danger areas, and general information.  
System has been devised for these waters. Remember, markings may vary by geograph-  
This system uses buoys and signs with dis- ic location. Always consult local boating au-  
tinctive shapes and colors to show regulatory thorities before driving your boat in unfamiliar  
or advisory information. These markers are waters.  
ZMU01708  
7
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General information  
EMU25171  
Identification numbers record  
EMU25183  
Outboard motor serial number  
The outboard motor serial number is stamped  
on the label attached to the port side of the  
clamp bracket.  
Record your outboard motor serial number in  
the spaces provided to assist you in ordering  
spare parts from your Yamaha dealer or for  
reference in case your outboard motor is sto-  
len.  
1. Outboard motor serial number location  
8
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General information  
EMU33520  
Read manuals and labels  
Before operating or working on this motor:  
G Read this manual.  
G Read any manuals supplied with the boat.  
G Read all labels on the outboard motor and the boat.  
If you need any additional information, contact your Yamaha dealer.  
EMU33831  
Warning labels  
If these labels are damaged or missing, contact your Yamaha dealer for replacements.  
9.9, 15  
1
2
3
ZMU06037  
9
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General information  
1
2
3
ZMU05697  
EMU33843  
Read Owners Manual  
Symbols  
The following symbols mean as follows.  
Notice/Warning  
ZMU05664  
ZMU05696  
10  
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General information  
Hazard caused by continuous rotation  
Engine start/ Engine cranking  
ZMU05665  
ZMU05668  
Electrical hazard  
ZMU05666  
Remote control lever/gear shift lever operat-  
ing direction, dual direction  
ZMU05667  
11  
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Specifications and requirements  
EMU31480  
Spark plug (NGK):  
B7HS-10  
Specifications  
TIP:  
Spark plug gap:  
0.91.0 mm (0.0350.039 in)  
Control system:  
(AL)stated in the specification data below  
represents the numerical value for the alumi-  
num propeller installed.  
Tiller  
Likewise, (SUS)represents the value for  
stainless steel propeller installed and (PL)”  
Starting system:  
Manual  
for plastic propeller installed.  
EMU2821E  
Starting carburetion system:  
Choke valve  
Alternator output:  
80 W  
Drive unit:  
Gear positions:  
Forward-neutral-reverse  
Gear ratio:  
2.08 (27/13)  
Trim and tilt system:  
Manual tilt  
Propeller mark:  
J
Dimension:  
Overall length:  
873 mm (34.4 in)  
Overall width:  
332 mm (13.1 in)  
Overall height S:  
1040 mm (40.9 in)  
Transom height S:  
440 mm (17.3 in)  
Weight (AL) S:  
36.0 kg (79 lb)  
Performance:  
Fuel and oil:  
Recommended fuel:  
Regular unleaded gasoline  
Min. pump octane:  
86  
Fuel tank capacity:  
24.0 L (6.34, US gal, 5.28 Imp.gal)  
Recommended engine oil:  
YAMALUBE 2-stroke outboard motor oil  
Fuel:oil ratio:  
Regular gasoline:  
100 :1  
Lubrication:  
Pre-mixed fuel and oil  
Recommended gear oil:  
Hypoid gear oil SAE#90  
Gear oil quantity:  
0.250 L (0.264 US qt, 0.220 Imp.qt)  
Full throttle operating range:  
45005500 r/min  
Maximum output:  
15MH 11.0 kW@5000 r/min (15  
HP@5000 r/min)  
9.9MH 7.3 kW@5000 r/min (9.9  
HP@5000 r/min)  
Idling speed (in neutral):  
750 50 r/min  
Engine:  
Type:  
2-stroke L  
Displacement:  
246.0 cm³  
Bore × stroke:  
56.0 × 50.0 mm (2.20 × 1.97 in)  
Ignition system:  
CDI  
12  
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Specifications and requirements  
EMU25694  
Tightening torque for engine:  
Battery requirements  
Spark plug:  
EMU25730  
25.0 Nm (2.55 kgf-m, 18.4 ft-lb)  
Propeller nut:  
17.0 Nm (1.73 kgf-m, 12.5 ft-lb)  
EMU33554  
Without a rectifier or Rectifier Regula-  
tor  
ECM01090  
NOTICE  
Installation requirements  
A battery cannot be connected to models  
that do not have a rectifier or Rectifier  
Regulator.  
EBMoU3a35t63horsepower rating  
EWM01560  
WARNING  
Overpowering a boat can cause severe in-  
stability.  
If you wish to use a battery with the models  
without a rectifier or Rectifier Regulator, install  
an optional Rectifier Regulator.  
Before installing the outboard motor(s), con-  
firm that the total horsepower of your motor(s)  
does not exceed the boats maximum horse-  
power rating. See the boats capacity plate or  
Using a maintenance-free battery with the  
above models can shorten the life of the bat-  
tery significantly.  
Install an optional Rectifier Regulator or use  
accessories rated to withstand 18 volts or  
higher with the above models. Consult your  
Yamaha dealer for details on installing an op-  
contact the manufacturer.  
EMU33571  
Mounting motor  
EWM01570  
tional Rectifier Regulator.  
EMU34192  
WARNING  
G Improper mounting of the outboard mo-  
tor could result in hazardous conditions  
such as poor handling, loss of control,  
or fire hazards.  
G Because the motor is very heavy, spe-  
cial equipment and training is required  
to mount it safely.  
Propeller selection  
Next to selecting an outboard, choosing the  
right propeller is one of the most important  
purchasing decisions a boater can make. The  
type, size, and design of your propeller have  
a direct impact on acceleration, top speed,  
fuel economy, and even engine life. Yamaha  
designs and manufactures propellers for ev-  
ery Yamaha outboard motor and every appli-  
cation.  
Your dealer or other person experienced in  
proper rigging should mount the motor using  
correct equipment and complete rigging in-  
structions. For further information, see page  
23.  
Your outboard motor came with a Yamaha  
propeller chosen to perform well over a range  
of applications, but there may be uses where  
a different propeller would be more appropri-  
ate.  
Your Yamaha dealer can help you select the  
right propeller for your boating needs. Select  
a propeller that will allow the engine to reach  
the middle or upper half of the operating  
range at full throttle with the maximum boat-  
13  
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Specifications and requirements  
EMU36360  
load. Generally, chose a larger pitch propeller  
Fuel requirements  
for a smaller operating load and a smaller  
pitch propeller for a heavier load. If you carry  
loads that vary widely, chose the propeller  
that lets the engine run in the proper range for  
your maximum load but remember that you  
may need to reduce your throttle setting to  
stay within the recommended engine speed  
range when carrying lighter loads.  
EMU36781  
Gasoline  
Use a good quality gasoline that meets the  
minimum octane rating. If knocking or pinging  
occurs, use a different brand of gasoline or  
premium unleaded fuel. Yamaha recomends  
that you use alcohol-free (see Gasohol) gas-  
oline whenever possible.  
For instructions on propeller removal and in-  
stallation, see page 49.  
Recommended gasoline:  
Regular unleaded gasoline with a mini-  
mum Octane rating of 86 (Pump Oc-  
tane Number) = (R+M)/2  
ECM01981  
x
-
NOTICE  
1
2 3  
G Do not use leaded gasoline. Leaded gas-  
oline can seriously damage the engine.  
G Avoid getting water and contaminants in  
the fuel tank. Contaminated fuel can  
cause poor performance or engine dam-  
age. Use only fresh gasoline that has  
been stored in clean containers.  
ZMU04606  
1. Propeller diameter in inches  
2. Propeller pitch in inches  
3. Type of propeller (propeller mark)  
Gasohol  
EMU25770  
There are two types of gasohol: gasohol con-  
taining ethanol (E10) and that containing  
methanol. Ethanol can be used if the ethanol  
content does not exceed 10% and the fuel  
meets the minimum octane ratings. E85 is a  
fuel containing 85% ethanol and must not be  
used in your outboard motor. All ethanol  
blends containing more than 10% ethanol can  
cause fuel system damage or cause engine  
starting and running problems. Yamaha does  
not recommend gasohol containing methanol  
because it can cause fuel system damage or  
engine performance problems.  
Start-in-gear protection  
Yamaha outboard motors or Yamaha-ap-  
proved remote control units are equipped with  
start-in-gear protection device(s). This feature  
permits the engine to be started only when it  
is in neutral. Always select neutral before  
starting the engine.  
EMU2565E1 ngine oil requirements  
Recommended engine oil:  
YAMALUBE 2-stroke outboard motor  
oil  
If the recommended engine oil is not avail-  
able, another 2-stroke engine oil with an  
NMMA-certified TC-W3 rating may be used.  
It is recommended that you install a water-  
separating marine fuel filter assembly (10 mi-  
cron minimum) between your boats fuel tank  
and outboard motor when using ethanol. Eth-  
14  
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Specifications and requirements  
anol is known to allow moisture to be ab- tor in muddy or acidic water conditions.  
sorbed into boat fuel tanks and systems. However, depending on the model it might not  
Moisture in the fuel can cause corrosion of be required.  
EMU36330  
metallic fuel system components, starting and  
Anti-fouling paint  
running complaints and require additional fuel  
A clean hull improves boat performance. The  
system maintenance.  
ERMiUn27g270Free Fuel Additive  
boat bottom should be kept as clean of marine  
growth as possible. If necessary, the boat bot-  
Gasoline is a precise blend of many different  
substances, each chosen to give certain char-  
acteristics. Gasoline blends have been  
changing in recent years in response to con-  
cerns about pollution and resulting emissions  
regulations. One of the most obvious changes  
has been the elimination of lead from most fu-  
els.  
tom can be coated with an anti-fouling paint  
approved for your area to inhibit marine  
growth.  
Do not use anti-fouling paint which includes  
copper or graphite. These paints can cause  
more rapid engine corrosion.  
As gasoline has changed, the amount of addi-  
tives such as aromatics and oxygenates has  
increased. These additives are important for  
the engines in passenger cars, but they can  
have detrimental effects in marine engines,  
because of increased deposits in the combus-  
tion chamber. When enough deposits collect,  
piston rings begin sticking. Performance  
drops and engine wear increases dramatical-  
ly.  
While many additives available may reduce  
deposits, Yamaha recommends the use of  
Ring Free Fuel Additive, available from your  
Yamaha dealer. Ring Free Fuel Additive  
has repeatedly proven its ability to clean com-  
bustion deposits from inside the engine, nota-  
bly the critical piston-ring-land area, and fuel  
system components. Follow product labeling  
for use instructions.  
EMMU363o41tor disposal requirements  
Never illegally discard (dump) the motor.  
Yamaha recommends consulting the dealer  
about discarding the motor.  
EMU36351Emergency equipment  
Keep the following items onboard in case  
there is trouble with the motor.  
G A tool kit with assorted screwdrivers, pliers,  
wrenches (including metric sizes), and  
electrical tape.  
G Waterproof flashlight with extra batteries.  
G An extra engine shut-off cord (lanyard) with  
clip.  
G Spare parts, such as an extra set of spark  
plugs.  
EMU36880 Muddy or acidic water  
Yamaha strongly recommends that you have  
your dealer install the optional chromium-plat-  
ed water pump kit if you use the outboard mo-  
Consult your Yamaha dealer for details.  
15  
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Specifications and requirements  
EMEU25m221ission control information  
ENMoU2r52t3h0 American models  
This engine conforms to U.S. Environmental  
Protection Agency (EPA) regulations for ma-  
rine SI engines. See the label affixed to your  
engine for details.  
EMU30390  
Approval label of emission control certifi-  
cate  
This label is attached to the bottom cowling.  
1. Manufactured date label location  
Existing Technology; N/A  
1
Manufactured:  
ZMU04346  
ZMU06058  
1. Approval label location  
EMU25262  
Manufactured date label  
This label is attached to the clamp bracket or  
the swivel bracket.  
16  
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Components  
EMU2579M  
Components diagram  
TIP:  
* May not be exactly as shown; also may not be included as standard equipment on all models.  
9.9, 15  
1. Top cowling  
17.Cooling water inlet  
18.Propeller*  
19.Fuel hose  
2. Cowling lock lever  
3. Cooling water pilot hole  
4. Tilt lock lever  
EMU25802  
5. Manual starter handle  
6. Gear shift lever  
Fuel tank  
If your model was equipped with a portable  
7. Engine stop button/Engine shut-off switch  
8. Tiller handle  
fuel tank, its function is as follows.  
EWM00020  
9. Throttle friction adjuster  
10.Clamp screw  
11.Carrying handle  
12.Choke knob  
13.Restraint cable attachment  
14.Clamp bracket  
WARNING  
The fuel tank supplied with this engine is  
its dedicated fuel reservoir and must not  
be used as a fuel storage container. Com-  
mercial users should conform to relevant  
licensing or approval authority regula-  
tions.  
15.Trim rod  
16.Anti-cavitation plate  
17  
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Components  
2
1
4
3
ZMU02284  
1. Fuel joint  
EMU25922  
Gear shift lever  
2. Fuel gauge  
3. Fuel tank cap  
4. Air vent screw  
Pulling the gear shift lever towards you puts  
the engine in forward gear so that the boat  
moves ahead. Pushing the lever away from  
you puts the engine in reverse gear so that the  
boat moves astern.  
EMU25830  
Fuel joint  
This joint is used to connect the fuel line.  
EMU25841  
Fuel gauge  
This gauge is located on either the fuel tank  
cap or on the fuel joint base. It shows the ap-  
proximate amount of fuel remaining in the  
tank.  
EMU25850  
Fuel tank cap  
This cap seals the fuel tank. When removed,  
the tank can be filled with fuel. To remove the  
cap, turn it counterclockwise.  
EAMiUr25v86e0 nt screw  
1. Forward “ ”  
2. Neutral “ ”  
3. Reverse “ ”  
This screw is on the fuel tank cap. To loosen  
the screw, turn it counterclockwise.  
EMU25911  
EMU25941  
Throttle grip  
Tiller handle  
The throttle grip is on the tiller handle. Turn  
the grip counterclockwise to increase speed  
and clockwise to decrease speed.  
To change direction, move the tiller handle to  
the left or right as necessary.  
18  
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Components  
EMU25961  
When constant speed is desired, tighten the  
adjuster to maintain the desired throttle set-  
ting.  
EEMnU2g59i9n3 e shut-off cord (lanyard) and  
clip  
Throttle indicator  
The fuel consumption curve on the throttle in-  
dicator shows the relative amount of fuel con-  
sumed for each throttle position. Choose the  
setting that offers the best performance and  
fuel economy for the desired operation.  
The clip must be attached to the engine shut-  
off switch for the engine to run. The cord  
should be attached to a secure place on the  
operators clothing, or arm or leg. Should the  
operator fall overboard or leave the helm, the  
cord will pull out the clip, stopping ignition to  
the engine. This will prevent the boat from  
running away under power. WARNING! At-  
tach the engine shut-off cord to a secure  
place on your clothing, or your arm or leg  
while operating. Do not attach the cord to  
clothing that could tear loose. Do not route  
the cord where it could become entangled,  
preventing it from functioning. Avoid acci-  
dentally pulling the cord during normal  
operation. Loss of engine power means  
the loss of most steering control. Also,  
without engine power, the boat could slow  
rapidly. This could cause people and ob-  
jects in the boat to be thrown forward.  
[EWM00122]  
1. Throttle indicator  
EMU25975  
Throttle friction adjuster  
A friction device provides adjustable resis-  
tance to movement of the throttle grip or the  
remote control lever, and can be set accord-  
ing to operator preference.  
To increase resistance, turn the adjuster  
clockwise. To decrease resistance, turn the  
adjuster counterclockwise. WARNING! Do  
not overtighten the friction adjuster. If  
there is too much resistance, it could be  
difficult to move the remote control lever  
or throttle grip, which could result in an  
accident.  
[EWM00032]  
19  
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Components  
1. Cord  
1. Use to start a hot engine  
2. Clip  
3. Engine shut-off switch  
2. Use to warm up a cold engine or restart a  
warm engine  
3. Use to warm up a cold engine or restart a  
warm engine  
4. Use to start a cold engine  
EEMnU2g60i0n1 e stop button  
To open the ignition circuit and stop the en-  
EMU26070  
gine, push this button.  
Manual starter handle  
To start the engine, first gently pull the handle  
out until resistance is felt. From that position,  
then pull the handle straight out quickly to  
crank the engine.  
ECMhU2o603k0e knob  
To supply the engine with the rich fuel mixture  
required to start, pull out this knob. The choke  
knob has the 4 operating positions shown in  
the following illustration.  
ESMtUe26e12r2ing friction adjuster  
A friction device provides adjustable resis-  
tance to the steering mechanism, and can be  
set according to operator preference. An ad-  
justing screw or bolt is located on the swivel  
bracket.  
20  
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Components  
1. Tilt lock lever  
To increase resistance, turn the adjuster  
clockwise.  
To decrease resistance, turn the adjuster  
counterclockwise.  
EWM00040  
To tilt the outboard motor up, set the tilt lock  
lever to the “ ” (up) position. To tilt the out-  
board motor down, set the tilt lock lever to the  
(down) position.  
EMU26332  
WARNING  
Tilt support bar  
The tilt support bar keeps the outboard motor  
in the tilted up position.  
Do not overtighten the friction adjuster. If  
there is too much resistance, it could be  
difficult to steer, which could result in an  
accident.  
EMU26261  
Trim rod (tilt pin)  
The position of the trim rod determines the  
minimum trim angle of the outboard motor in  
relation to the transom.  
ECM01660  
NOTICE  
Do not use the tilt support bar when traile-  
ring the boat. The outboard motor could  
shake loose from the tilt support and fall.  
If the motor cannot be trailered in the nor-  
mal running position, use an additional  
support device to secure it in the tilt posi-  
tion.  
EMU30440  
Tilt lock mechanism  
The tilt lock mechanism is used to prevent the  
outboard motor from lifting out of the water  
when in reverse gear.  
21  
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Components  
ECMoU2w637l3ing lock lever(s) (turn type)  
To remove the engine top cowling, turn the  
cowling lock lever(s) and lift off the cowling.  
When installing the cowling, check to be sure  
it fits properly in the rubber seal. Then lock the  
cowling again by returning the cowling lock le-  
ver(s) to the lock position.  
1. Carrying handle  
2. Clamp bracket bar  
1. Cowling lock lever(s)  
ECMaU2r6r43y0 ing handle  
A carrying handle is included on the clamp  
bracket. After setting the handle up, it enables  
you to carry the outboard motor easily with  
one hand.  
To set up the carrying handle, proceed as fol-  
lows:  
1. Place the tilt lock lever in the lock posi-  
tion.  
2. Securely hook the arm on the carrying  
handle end to the clamp bracket bar.  
ECM00080  
NOTICE  
Place the tilt lock lever in the lock position  
while using the carrying handle. Other-  
wise, the lower unit could fall to the  
ground while carrying the motor.  
22  
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Installation  
EMU26902  
Installation  
The information presented in this section is in-  
tended as reference only. It is not possible to  
provide complete instructions for every possi-  
ble boat and motor combination. Proper  
mounting depends in part on experience and  
the specific boat and motor combination.  
EWM01590  
1
WARNING  
ZMU01760  
G Overpowering a boat could cause se-  
vere instability. Do not install an out-  
board motor with more horsepower than  
the maximum rating on the capacity  
plate of the boat. If the boat does not  
have a capacity plate, consult the boat  
manufacturer.  
G Improper mounting of the outboard mo-  
tor could result in hazardous conditions  
such as poor handling, loss of control,  
or fire hazards. For permanently mount-  
ed models, your dealer or other person  
experienced in proper rigging should  
mount the motor.  
1. Center line (keel line)  
EMU26923  
Mounting height  
To run your boat at optimum efficiency, the  
water resistance (drag) of the boat and out-  
board motor must be made as little as possi-  
ble. The mounting height of the outboard  
motor greatly affects the water resistance. If  
the mounting height is too high, cavitation  
tends to occur, thus reducing the propulsion;  
and if the propeller tips cut the air, the engine  
speed will rise abnormally and cause the en-  
gine to overheat. If the mounting height is too  
low, the water resistance will increase and  
thereby reduce engine efficiency. Mount the  
outboard motor so that the anti-cavitation  
plate is between the bottom of the boat and a  
level 25 mm (1 in) below it.  
EMU26911  
Mounting the outboard motor  
EWM01720  
WARNING  
Your dealer or other person experienced  
in proper outboard motor mounting  
should show you how to mount your out-  
board motor.  
The outboard motor should be mounted so  
that the boat is well balanced. Otherwise, the  
boat could be hard to steer. For single-engine  
boats, mount the outboard motor on the cen-  
terline (keel line) of the boat.  
0–25mm  
(0–1in)  
ZMU02011  
23  
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Installation  
ECM01631  
allow the outboard motor to fall off or  
move on the transom. This could  
cause loss of control and serious inju-  
ry. Make sure the transom screws are  
tightened securely. Occasionally  
check the screws for tightness during  
NOTICE  
G Check that the idle hole stays high  
enough to keep out water getting inside  
engine even if the boat is in stationary  
with maximum load.  
G Incorrect engine height or obstructions  
to the smooth flow of water (such as the  
design or condition of the boat, or ac-  
cessories such as transom ladders or  
depth finder transducers) can create air-  
borne water spray while the boat is  
cruising. If the motor is operated contin-  
uously in the presence of airborne water  
spray, enough water could enter the en-  
gine through the intake opening on the  
cowling to cause severe engine dam-  
age. Eliminate the cause of the airborne  
water spray.  
operation.  
[EWM00641]  
ZMU02012  
2. If the restraint cable attachment is  
equipped on your engine, a restraint ca-  
ble or chain should be used. Attach one  
end to the restraint cable attachment and  
the other to a secure mounting point on  
the boat. Otherwise the engine could be  
completely lost if it accidentally falls off  
the transom.  
TIP:  
G The optimum mounting height of the out-  
board motor is affected by the boat and mo-  
tor combination and the desired use. Test  
runs at different heights can help determine  
the optimum mounting height. Consult your  
Yamaha dealer or boat manufacturer for  
further information on determining the prop-  
er mounting height.  
G For instructions on setting the trim angle of  
the outboard motor, see page 35.  
ECMlUa26m972ping the outboard motor  
1. Place the outboard motor on the transom  
so that it is positioned as close to the cen-  
ter as possible. Tighten the transom  
clamp screws evenly and securely. Oc-  
casionally check the clamp screws for  
tightness during operation of the out-  
board motor because they could become  
loose due to engine vibration.  
WARNING! Loose clamp screws could  
ZMU02013  
3. Secure the clamp bracket to the transom  
using the bolts provided with the out-  
board (if packed). For details, consult  
your Yamaha dealer. WARNING! Avoid  
using bolts, nuts or washers other  
than those contained in the engine  
24  
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Installation  
packaging. If used, they must be of at  
least the same quality of material and  
strength and must be tightened se-  
curely. After tightening, test run the  
engine and check their tightness.  
[EWM00651]  
25  
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Operation  
EMU36381  
3. Next two hours:  
First-time operation  
Accelerate at full throttle onto plane, then  
reduce engine speed to three-quarter  
throttle (approximately 4000 r/min). Vary  
engine speed occasionally. Run at full  
throttle for one minute, then allow about  
10 minutes of operation at three-quarter  
throttle or less to let the engine cool.  
4. Remaining seven hours:  
EBMrU3e0a17k4 ing in engine  
Your new engine requires a period of break-in  
to allow mating surfaces of moving parts to  
wear in evenly. Correct break-in will help en-  
sure proper performance and longer engine  
life. NOTICE: Failure to follow the break-in  
procedure could result in reduced engine  
Run the engine at any speed. However,  
avoid operating at full throttle for more  
than 5 minutes at a time.  
life or even severe engine damage.  
[ECM00801]  
EMU27050  
Gasoline and engine oil mixing chart  
(25:1)  
5. After the first 10 hours:  
Operate the engine normally. Use the  
standard premix ratio of gasoline and oil.  
For details on mixing fuel and oil, see  
page 28.  
EMU36400  
Getting to know your boat  
Different boats handle differently. Operate  
cautiously while you learn how your boat han-  
dles under different conditions and with differ-  
1.  
: Gasoline  
2. : Engine oil  
ent trim angles (see page 35).  
EMU36412  
ECM00150  
NOTICE  
Checks before starting engine  
EWM01920  
Be sure to mix gasoline and oil complete-  
ly, otherwise the engine may be damaged.  
WARNING  
If any item in the checks before starting  
engine is not working properly, have it in-  
spected and repaired before operating the  
outboard motor. Otherwise an accident  
could occur.  
EMU27074  
Procedure for pre-mixed models  
Run the engine under load (in gear with a pro-  
peller installed) for 10 hours as follows.  
1. First 10 minutes:  
Run the engine at the lowest possible  
speed. A fast idle in neutral is best.  
2. Next 50 minutes:  
ECM00120  
NOTICE  
Do not start the engine out of water. Over-  
heating and serious engine damage can  
occur.  
Do not exceed half throttle (approximate-  
ly 3000 r/min). Vary engine speed occa-  
sionally. If you have an easy-planing  
boat, accelerate at full throttle onto plane,  
then immediately reduce the throttle to  
3000 r/min or less.  
EMU37141  
Fuel level  
Be sure you have plenty of fuel for your trip. A  
good rule is to use 1/3 of your fuel to get to the  
destination, 1/3 to return, and to keep 1/3 as  
26  
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Operation  
EMU37320  
an emergency reserve. With the boat level on  
a trailer or in the water, check the fuel level.  
For fuel filling instructions, see page 28.  
Check the fuel filter  
Check that the fuel filter is clean and free of  
water. If any water is found in the fuel, or if a  
significant amount of debris is found, the fuel  
tank should be checked and cleaned by a  
Yamaha dealer.  
ERMeU3m657o0 ve cowling  
For the following checks, remove the top  
cowling from the engine. To remove the en-  
gine top cowling, release the lock lever and lift  
off the cowling.  
ECMoU3n689t1rols  
ZMU06092  
G Move the tiller handle fully to the left and  
right to make sure operation is smooth.  
G Turn the throttle grip from the fully closed to  
the fully open position. Make sure that it  
turns smoothly and that it completely re-  
turns to the fully closed position.  
G Look for loose or damaged connections of  
the throttle and shift cables.  
EEMnU3g64i8n1 e shut-off cord (lanyard)  
Inspect the engine shut-off cord for damage,  
such as cuts, breaks, and wear.  
EMU36442  
Fuel system  
EWM00060  
WARNING  
Gasoline and its vapors are highly flam-  
mable and explosive. Keep away from  
sparks, cigarettes, flames, or other sourc-  
es of ignition.  
EWM00910  
WARNING  
Leaking fuel can result in fire or explosion.  
G Check for fuel leakage regularly.  
G If any fuel leakage is found, the fuel sys-  
tem must be repaired by a qualified me-  
chanic. Improper repairs can make the  
outboard unsafe to operate.  
EMU36451  
Check for fuel leaks  
G Check for fuel leaks or gasoline fumes in  
the boat.  
G Check for fuel leakage from the fuel system.  
G Check the fuel tank and fuel lines for  
cracks, swellings, or other damages.  
1. Cord  
2. Clip  
27  
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Operation  
3. Engine shut-off switch  
EMU27120  
Oil  
G Check to be sure you have plenty of oil for  
your trip.  
EEMnU2g71i4n1 e  
G Check the engine and engine mounting.  
G Look for loose or damaged fasteners.  
G Check the propeller for damage.  
EInMUs36t9a53ll cowling  
EMU27234  
Filling fuel and engine oil  
1. Be sure that a cowling lock lever is re-  
EMU27247  
leased.  
Filling fuel for portable tank  
2. Be sure that the rubber seal is seated all  
the way around the top cowling.  
EWM01830  
WARNING  
3. Place the top cowling on bottom cowling.  
4. Check to be sure the rubber seal fits cor-  
rectly all the way around the engine.  
5. Move the lever to lock the cowling as  
shown. NOTICE: If the cowling is not  
installed correctly, water spray under  
the cowling can damage the engine, or  
the cowling can blow off at high  
G Gasoline and its vapors are highly flam-  
mable and explosive. Always refuel ac-  
cording to this procedure to reduce the  
risk of fire and explosion.  
G Gasoline is poisonous and can cause in-  
jury or death. Handle gasoline with care.  
Never siphon gasoline by mouth. If you  
should swallow some gasoline or inhale  
a lot of gasoline vapor, or get some gas-  
oline in your eyes, see your doctor im-  
mediately. If gasoline spills on your  
skin, wash with soap and water. If gaso-  
line spills on your clothing, change your  
clothes.  
speeds.  
[ECM01990]  
1. Be sure the engine is stopped.  
2. Disconnect the fuel line from the fuel tank  
and tighten the air vent screw on the fuel  
tank cap.  
ZMU06117  
After installing, check the fitting of the top  
cowling by pushing it with both hands. If the  
top cowling is loose, have it repaired by your  
Yamaha dealer.  
28  
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Operation  
ZMU02834  
ZMU06621  
9. Tighten the filler cap securely.  
10. Wipe up any spilled gasoline immediately  
with dry rags. Dispose rags properly ac-  
cording to local laws or regulations.  
EMU27406  
Gasoline and oil mixing (100:1)  
ECM00811  
NOTICE  
G Avoid using any oil other than the spec-  
ified type.  
ZMU02301  
G Use a thoroughly blended fuel-oil mix-  
ture.  
3. Remove the portable tank from the boat.  
4. Be sure you are in a well-ventilated out-  
door area, either securely moored or trail-  
ered.  
5. Do not smoke and keep away from  
sparks, flames, static electric discharge,  
or other sources of ignition.  
G If the mixture is not thoroughly mixed, or  
if the mixing ratio is incorrect, the fol-  
lowing problems could occur.  
G Low oil ratio: Lack of oil could cause ma-  
jor engine trouble, such as piston sei-  
zure.  
6. If you use a portable container to store  
and dispense fuel, use only an approved  
GASOLINE container.  
G High oil ratio: Too much oil could cause  
fouled spark plugs, smoky exhaust, and  
heavy carbon deposits.  
7. Touch the fuel nozzle to the filler opening  
or funnel to help prevent electrostatic  
sparks.  
Gasoline to engine oil  
ratio  
8. Fill the fuel tank, but do not overfill. Fuel  
can expand and overflow if the tempera-  
ture increases.  
Break-in period  
After break-in  
See page 26  
100:1  
Fuel tank capacity:  
24.0 L (6.34, US gal, 5.28 Imp.gal)  
29  
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Operation  
4. Make sure that the oil and gasoline are  
mixed.  
If equipped with a built-in fuel tank  
1. Pour oil into a clean fuel can, and then  
add gasoline.  
100:1  
1 L  
12 L  
14 L  
24 L  
(0.26 US gal,  
0.22 Imp gal)  
(3.2 US gal,  
2.6 Imp gal)  
(3.7 US gal,  
3.1 Imp gal)  
(6.3 US gal,  
5.3 Imp gal)  
0.01 L  
0.12 L  
0.14 L  
0.24 L  
2. Replace the fuel can cap and close tight-  
ly.  
(0.01 US qt,  
0.01 Imp qt)  
(0.13 US qt,  
0.11 Imp qt)  
(0.15 US qt,  
0.12 Imp qt)  
(0.25 US qt,  
0.21 Imp qt)  
3. Shake the fuel can to mix the fuel thor-  
oughly.  
4. Make sure that the oil and gasoline are  
mixed.  
ZMU04910  
1.  
: Gasoline  
2. : Engine oil  
5. Pour the gasoline and oil mixture into the  
built-in fuel tank.  
If equipped with a portable fuel tank  
1. Pour oil into the portable fuel tank, and  
then add gasoline.  
TIP:  
If using a permanently installed tank, pour the  
oil gradually as the gasoline is being added to  
the tank.  
EMU27451  
Operating engine  
ESMeU2n74d66ing fuel (portable tank)  
EWM00420  
WARNING  
G Before starting the engine, make sure  
that the boat is tightly moored and that  
you can steer clear of any obstructions.  
Be sure there are no swimmers in the  
water near you.  
G When the air vent screw is loosened,  
gasoline vapor will be released. Gaso-  
line is highly flammable, and its vapors  
are flammable and explosive. Refrain  
from smoking, and keep away from  
open flames and sparks while loosening  
the air vent screw.  
G This product emits exhaust gases which  
contain carbon monoxide, a colorless,  
odorless gas which could cause brain  
damage or death when inhaled. Symp-  
toms include nausea, dizziness, and  
1. Engine oil  
2. Gasoline  
2. Replace the fuel tank cap and close tight-  
ly.  
3. Shake the fuel tank to mix the fuel thor-  
oughly.  
30  
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Operation  
drowsiness. Keep cockpit and cabin ar-  
eas well ventilated. Avoid blocking ex-  
haust outlets.  
TIP:  
Wipe up any spilled gasoline immediately with  
dry rags. Dispose rags properly according to  
local laws or regulations.  
3. Squeeze the primer pump, with the arrow  
pointing up, until you feel it become firm.  
During engine operation place the tank  
horizontally, otherwise fuel cannot be  
drawn from the fuel tank.  
1. If there is an air vent screw on the fuel  
tank cap, loosen it 2 or 3 turns.  
ZMU02295  
2. If there is a fuel joint on the motor, firmly  
connect the fuel line to the joint. Then  
firmly connect the other end of the fuel  
line to the joint on the fuel tank.  
1. Arrow  
ESMtUa27r4t93ing engine  
EWM01600  
WARNING  
Before starting the engine, make sure that  
the boat is tightly moored and that you can  
steer clear of any obstructions. Be sure  
there are no swimmers in the water near  
you.  
EMU27532  
Manual start models  
EWM01840  
WARNING  
G Failure to attached engine shut-off cord  
could result in a runaway boat if opera-  
tor is ejected. Attach the engine shut-off  
cord to a secure place on your clothing,  
or your arm or leg while operating. Do  
not attach the cord to clothing that could  
tear loose. Do not route the cord where  
it could become entangled, preventing it  
from functioning.  
ZMU02024  
31  
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Operation  
G Avoid accidentally pulling the cord dur-  
ing normal operation. Loss of engine  
power means the loss of most steering  
control. Also, without engine power, the  
boat could slow rapidly. This could  
cause people and objects in the boat to  
be thrown forward.  
1. Place the gear shift lever in neutral.  
4. Pull out / turn the choke knob fully. Place  
the choke knob back in to the second or  
third position to warm up the engine after  
starting. When the engine has fully  
warmed up, replace the choke knob back  
in to its home position.  
TIP:  
The start-in-gear protection device prevents  
the engine from starting except when in neu-  
tral.  
2. Attach the engine shut-off cord to a se-  
cure place on your clothing, or your arm  
or leg. Then install the clip on the other  
end of the cord into the engine shut-off  
switch.  
TIP:  
G It is not necessary to use the choke when  
starting a warm engine.  
G If the choke knob is left in the pulled out po-  
sition while the engine is running, the en-  
gine will run poorly or stall.  
5. Pull the manual starter handle slowly until  
you feel resistance. Then give a strong  
pull straight out to crank and start the en-  
gine. Repeat if necessary.  
3. Place the throttle grip in the “  
(start) position.  
32  
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Operation  
ECM01810  
NOTICE  
If water is not flowing out of the pilot hole  
at all times while the engine is running,  
overheating and serious damage could  
occur. Stop the engine and check whether  
the cooling water inlet on the lower case or  
the cooling water pilot hole is blocked.  
Consult your Yamaha dealer if the prob-  
lem cannot be located and corrected.  
6. After the engine starts, slowly return the  
manual starter handle to its original posi-  
tion before releasing it.  
7. Slowly return the throttle grip to the fully  
closed position.  
TIP:  
G When the engine is cold, it needs to be  
warmed up. For further information, see  
page 33.  
ZMU02856  
G If the engine does not start on the first try,  
repeat the procedure. If the engine fails to  
start after 4 or 5 tries, open the throttle a  
small amount (between 1/8 and 1/4) and try  
again. Also if the engine is warm and fails to  
start, open the throttle a same amount and  
try to start the engine again. If the engine  
Check that no water leaks from the joints be-  
tween the exhaust cover, cylinder head, and  
body cylinder.  
EMU27670  
Warming up engine  
ECMhU2o768k3e start models  
still fails to start, see page 54.  
EMU36510  
After starting the engine, allow it to idle for 3  
minutes to warm up. Failure to do so will  
shorten engine life. Gradually return the  
choke knob to its home position as the engine  
Checks after starting engine  
ECMoU3o652l0ing water  
Check for a steady flow of water from the cool-  
ing water pilot hole. A continuous flow of water  
from the pilot hole shows that the water pump  
is pumping water through the cooling passag-  
es. If the cooling passages are frozen, it may  
take a while for water to start flowing out of the  
pilot hole.  
warms up.  
EMU36530  
Checks after engine warm-up  
ESMhU3i6f5t4i0ng  
While tightly moored, and without applying  
throttle, confirm that the engine shifts smooth-  
ly into forward and reverse, and back to neu-  
tral.  
33  
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Operation  
ESMtUo36p970switches  
G Press the engine stop button and make  
sure the engine stops.  
G Confirm that removing the clip from the en-  
gine shut-off switch stops the engine.  
G Confirm that the engine cannot be started  
with the clip removed from the engine shut-  
off switch.  
EMU34550  
Shifting  
EWM00180  
To shift from in gear (forward/reverse) to neu-  
tral  
WARNING  
Before shifting, make sure there are no 1. Close the throttle so that the engine  
swimmers or obstacles in the water near  
you.  
slows to idle speed.  
ECM01610  
NOTICE  
Warm up the engine before shifting into  
gear. Until the engine is warm, the idle  
speed may be higher than normal. High  
idle speed can prevent you from shifting  
back to neutral. If this occurs, stop the en-  
gine, shift to neutral, then restart the en-  
gine and allow it to warm up.  
ZMU02030  
2. After the engine is at idle speed in gear  
move the gear shift lever firmly and crisp-  
ly into the neutral position.  
To shift out of neutral  
Move the gear shift lever firmly and crisply for-  
ward (for forward gear) or backward (for re-  
verse gear). Be sure to check that the tilt lock  
lever is in the lock/down position (if equipped)  
before operating in reverse.  
34  
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Operation  
EMU31742  
EWM01510  
2. After stopping the engine, tighten the air  
vent screw on the fuel tank cap and set  
the fuel cock lever or knob to the closed  
position, if equipped.  
Stopping boat  
WARNING  
G Do not use the reverse function to slow  
down or stop the boat as it could cause  
you to lose control, be ejected, or impact  
the steering wheel or other parts of the  
boat. This could increase the risk of se-  
rious injury. It could also damage the  
shift mechanism.  
G Do not shift into reverse while traveling  
at planing speeds. Loss of control, boat  
swamping, or damage to the boat could  
occur.  
ZMU02301  
3. Disconnect the fuel line if you are using  
an external fuel tank.  
The boat is not equipped with a separate  
braking system. Water resistance stops it af-  
ter the throttle lever is moved back to idle. The  
stopping distance varies depending on gross  
weight, water surface conditions, and wind di-  
rection.  
EMU27821  
Stopping engine  
Before stopping the engine, first let it cool off  
for a few minutes at idle or low speed. Stop-  
ping the engine immediately after operating at  
high speed is not recommended.  
EPMrUo27c83e3 dure  
1. Push and hold the engine stop button un-  
TIP:  
If the outboard motor is equipped with an en-  
gine shut-off cord, the engine can also be  
stopped by pulling the cord and removing the  
clip from the engine shut-off switch.  
til the engine comes to a complete stop.  
EMU27T862rimming outboard motor  
EWM00740  
WARNING  
Excessive trim for the operating condi-  
tions (either trim up or trim down) can  
cause boat instability and can make steer-  
ing the boat more difficult. This increases  
35  
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Operation  
the possibility of an accident. If the boat  
begins to feel unstable or is hard to steer,  
slow down and/or readjust the trim angle.  
The trim angle of the outboard motor helps  
determine the position of the bow of the boat  
in the water. Correct trim angle will help im-  
prove performance and fuel economy while  
reducing strain on the engine. Correct trim an-  
gle depends upon the combination of boat,  
engine, and propeller. Correct trim is also af-  
fected by variables such as the load in the  
boat, sea conditions, and running speed.  
1. Trim rod  
3. Reposition the rod in the desired hole.  
To raise the bow (trim-out), move the rod  
away from the transom.  
To lower the bow (trim-in), move the rod to-  
ward the transom.  
Make test runs with the trim set to different an-  
gles to find the position that works best for  
your boat and operating conditions.  
EWM00400  
WARNING  
G Stop the engine before adjusting the  
trim angle.  
G Use care to avoid being pinched when  
removing or installing the rod.  
G Use caution when trying a trim position  
for the first time. Increase speed gradu-  
ally and watch for any signs of instability  
or control problems. Improper trim an-  
gle can cause loss of control.  
1
ZMU02043  
TIP:  
The outboard motor trim angle can be  
changed approximately 4 degrees by shifting  
the trim rod one hole.  
EAMdU2j7u91s1 ting boat trim  
When the boat is on plane, a bow-up attitude  
results in less drag, greater stability and effi-  
ciency. This is generally when the keel line of  
the boat is up about 3 to 5 degrees. With the  
bow up, the boat may have a greater tenden-  
1. Trim operating angle  
EAMdU2j7u87s2 ting trim angle for manual tilt  
models  
There are 4 or 5 holes provided in the clamp  
bracket to adjust the outboard motor trim an-  
gle.  
1. Stop the engine.  
2. Tilt the outboard motor up, and then re-  
move the trim rod from the clamp bracket.  
36  
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Operation  
cy to steer to one side or the other. Compen- the bow is greatly increased, heightening the  
sate for this as you steer. The trim tab can danger of bow steeringand making opera-  
also be adjusted to help offset this effect. tion difficult and dangerous.  
When the bow of the boat is down, it is easier  
to accelerate from a standing start onto plane.  
TIP:  
Depending on the type of boat, the outboard  
motor trim angle may have little effect on the  
trim of the boat when operating.  
EMU27934  
Bow Up  
Too much trim-out puts the bow of the boat  
too high in the water. Performance and econ-  
omy are decreased because the hull of the  
Tilting up and down  
boat is pushing the water and there is more air  
drag. Excessive trim-out can also cause the  
propeller to ventilate, which reduces perfor-  
mance further, and the boat may porpoise”  
(hop in the water), which could throw the op-  
erator and passengers overboard.  
If the engine will be stopped for some time or  
if the boat is moored in shallows, the outboard  
motor should be tilted up to protect the propel-  
ler and lower casing from damage by collision  
with obstructions, and also to reduce salt cor-  
rosion.  
EWM00221  
WARNING  
Be sure all people are clear of the out-  
board motor when tilting up and down,  
Body parts can be crushed between the  
motor and the clamp bracket when the mo-  
tor is trimmed or tilted.  
EWM00250  
WARNING  
Leaking fuel is a fire hazard. If there is a  
fuel joint on the outboard motor, discon-  
nect the fuel line or close the fuel cock if  
the engine will be tilted for more than a few  
minutes. Otherwise fuel may leak.  
Bow Down  
Too much trim-in causes the boat to plow”  
through the water, decreasing fuel economy  
and making it hard to increase speed. Operat-  
ing with excessive trim-in at higher speeds  
also makes the boat unstable. Resistance at  
37  
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Operation  
ECM00241  
NOTICE  
G Before tilting the outboard motor, stop  
the engine by following the procedure  
on page 35. Never tilt the outboard mo-  
tor while the engine is running. Severe  
damage from overheating can result.  
G Do not tilt up the engine by pushing the  
tiller handle (if equipped) because this  
could break the handle.  
4. Pull up the shallow water lever (if  
equipped).  
5. Hold the rear of the top cowling with one  
hand and tilt the engine up fully.  
EPMrUo32c66e2 dure for tilting up (manual tilt  
models)  
1. Place the gear shift lever in neutral.  
6. Push the tilt support knob into the clamp  
bracket. Or the tilt support bar will turn to  
the lock position automatically. NOTICE:  
Do not use the tilt support lever or  
knob when trailering the boat. The out-  
board motor could shake loose from  
the tilt support and fall. If the motor  
cannot be trailered in the normal run-  
ning position, use an additional sup-  
port device to secure it in the tilt  
position. For more detailed informa-  
2. Disconnect the fuel line from the out-  
board motor.  
tion, see page 41.  
[ECM01641]  
EMU28022  
3. Place the tilt lock lever (if equipped) in the  
release/up position.  
Procedure for tilting down (manual tilt  
models)  
1. Place the tilt lock lever in the re-  
lease/down position or return the shallow  
water lever to its original position.  
38  
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Operation  
ZMU02868  
EMU32741  
2. Slightly tilt the engine up until the tilt sup-  
port bar is automatically released.  
3. Slowly tilt the engine down.  
EMU28061  
Procedure  
1. Place the gear shift lever in neutral.  
Shallow water  
ECMrUu280i7s3ing in shallow water (manual tilt  
models)  
EWM01781  
WARNING  
G Run the boat at the lowest possible  
speed when using the shallow water  
cruising system. The tilt lock mecha-  
nism does not work while the shallow  
water cruising system is being used. Hit-  
ting an underwater obstacle could  
cause the outboard motor to lift out of  
the water, resulting in loss of control.  
G Use extra care when operating in re-  
verse. Too much reverse thrust can  
cause the outboard motor to lift out of  
the water, increasing the chance of acci-  
dent and personal injury.  
2. Place the tilt lock lever in the release/up  
position.  
ECM00260  
NOTICE  
Do not tilt the outboard motor up so that  
the cooling water inlet on the lower unit is  
above the surface of the water when set-  
ting up for and cruising in shallow water.  
Otherwise severe damage from overheat-  
ing can result.  
3. Slightly tilt the outboard motor up. The tilt  
support bar will lock automatically, sup-  
porting the outboard motor in a partially  
raised position. This outboard motor has  
2 positions for shallow water cruising.  
39  
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Operation  
acidic water or water with a lot of sediment in  
it, such as muddy or turbid (cloudy) water. Af-  
ter operating in such water, flush the cooling  
passages with fresh water to prevent corro-  
sion. Also rinse the outside of the outboard  
motor with fresh water.  
4. To return the outboard motor to the nor-  
mal running position, place the gear shift  
lever in neutral.  
5. Place the tilt lock lever in the lock/down  
position, then slightly tilt the outboard mo-  
tor up until the tilt support bar automati-  
cally returns to the free position.  
ZMU02048  
6. Slowly lower the outboard motor to the  
normal position.  
EMU28195  
Cruising in other conditions  
Cruising in salt water  
After operating in salt water, flush the cooling  
water passages with fresh water to prevent  
them from becoming clogged. Also rinse the  
outside of the outboard motor with fresh wa-  
ter.  
Cruising in muddy, turbid, or acidic water  
Yamaha strongly recommends that you use  
the optional chromium-plated water pump kit  
(see page 15) if you use the outboard motor in  
40  
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Maintenance  
EMU28227  
ECMlUa28m236p screw mounting models  
When transporting or storing the outboard  
motor while removed from a boat, keep the  
outboard motor in the attitude shown.  
Transporting and storing out-  
board motor  
EWM00693  
WARNING  
G USE CARE when transporting fuel tank,  
whether in a boat or car.  
G DO NOT fill fuel container to maximum  
capacity. Gasoline will expand consider-  
ably as it warms up and can build up  
pressure in the fuel container. This can  
cause fuel leakage and a potential fire  
hazard.  
EWM01860  
WARNING  
Leaking fuel is a fire hazard. When trans-  
porting and storing the outboard motor,  
close the fuel cock to prevent fuel from  
leaking. Never get under the engine while  
it is tilted. Severe injury could occur if the  
outboard motor accidentally falls.  
ECM00660  
NOTICE  
Do not use the tilt support lever or knob  
when trailering the boat. The outboard mo-  
tor could shake loose from the tilt support  
and fall. If the motor cannot be trailered in  
the normal running position, use an addi-  
tional support device to secure it in the tilt  
position.  
TIP:  
Place a towel or something similar under the  
outboard motor to protect it from damage.  
ESMtUo30r27i2ng outboard motor  
When storing your Yamaha outboard motor  
for prolonged periods of time (2 months or  
longer), several important procedures must  
be performed to prevent excessive damage.  
It is advisable to have your outboard motor  
serviced by an authorized Yamaha dealer pri-  
or to storage. However, you, the owner, with a  
minimum of tools, can perform the following  
procedures.  
The outboard motor should be trailered and  
stored in the normal running position. If there  
is insufficient road clearance in this position,  
then trailer the outboard motor in the tilt posi-  
tion using a motor support device such as a  
transom saver bar. Consult your Yamaha  
dealer for further details.  
41  
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Maintenance  
ECM01411  
NOTICE  
G Do not place the outboard motor on its  
side before the cooling water has  
drained from it completely, otherwise  
water may enter the cylinder through the  
exhaust port and cause engine trouble.  
G Store the outboard motor in a dry, well-  
ventilated place, not in direct sunlight.  
1
2
ZMU02051  
EPMrUo28c30e4 dure  
EMU28376  
1. Water surface  
2. Lowest water level  
Flushing in a test tank  
ECM00300  
5. Fill the tank with fresh water to above the  
level of the anti-cavitation plate. NOTICE:  
If the fresh water level is below the lev-  
el of the anti-cavitation plate, or if the  
water supply is insufficient, engine  
NOTICE  
Do not run the engine without supplying it  
with cooling water. Either the engine water  
pump will be damaged or the engine will  
be damaged from overheating. Before  
starting the engine, be sure to supply wa-  
ter to the cooling water passages.  
seizure may occur.  
[ECM00291]  
6. Cooling system flushing is essential to  
prevent the cooling system from clogging  
up with salt, sand, or dirt. In addition, fog-  
ging of the engine is mandatory to pre-  
vent excessive engine damage due to  
rust. Perform the flushing and fogging at  
the same time. WARNING! Do not  
touch or remove electrical parts when  
starting or during operation. Keep  
hands, hair, and clothes away from  
the flywheel and other rotating parts  
1. Wash the outboard motor body using  
fresh water. NOTICE: Do not spray wa-  
ter into the air intake.  
information, see page 43.  
[ECM01840]  
For further  
2. Fill the fuel tank with fresh fuel and add  
one ounce of Yamaha Fuel Conditioner  
and Stabilizerto each gallon of fuel.  
TIP:  
while the engine is running.  
[EWM00091]  
The use of Yamaha Fuel Conditioner and  
Stabilizereliminates the need to drain the  
fuel system. Consult your Yamaha dealer or  
other qualified mechanic if the fuel system is  
to be drained instead.  
3. Remove the engine top cowling and si-  
lencer cover.  
4. Install the outboard motor on the test  
tank.  
7. Run the engine at a fast idle for 1015  
minutes in neutral position.  
8. Just prior to turning off the engine, quickly  
spray Yamaha Stor-Rite Engine Fogging  
Oilalternately into each carburetor or the  
fogging hole of the silencer cover, if  
equipped. When properly done, the en-  
gine will smoke excessively and almost  
stall.  
9. Remove the outboard motor from the test  
tank.  
42  
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Maintenance  
10. Drain the cooling water completely out of  
the motor. Clean the body thoroughly.  
11. Install the silencer cover/cap and top  
cowling.  
EMU28402  
Lubrication  
1. Install the spark plug(s) and torque to  
proper specification. For information on  
spark plug installation, see page 48.  
2. Change the gear oil. For instructions, see  
page 51. Inspect the oil for the presence  
of water that indicates a leaky seal. Seal  
replacement should be performed by an  
authorized Yamaha dealer prior to use.  
3. Grease all grease fittings. For further de-  
tails, see page 47.  
ECMhU2e84c60king painted surface of motor  
Check the motor for scratches, nicks, or flak-  
ing paint. Areas with damaged paint are more  
likely to corrode. If necessary, clean and paint  
the areas. A touch-up paint is available from  
your Yamaha dealer.  
TIP:  
EMU37081 Periodic maintenance  
For long-term storage, fogging the engine  
with oil is recommended. Contact your  
Yamaha dealer for information about fogging  
oil and procedures for your engine.  
ECMlUe28a42n3 ing and anticorrosion measures  
1. Wash down the exterior of the outboard  
motor with fresh water and dry off com-  
pletely. NOTICE: Do not spray water  
EWM01981  
WARNING  
These procedures require mechanical  
skills, tools, and supplies. If you do not  
have the proper skills, tools, or supplies to  
perform a maintenance procedure, have a  
Yamaha dealer or other qualified mechan-  
ic do the work.  
into the air intake.  
[ECM01840]  
The procedures involve disassembling  
the motor and exposing dangerous parts.  
To reduce the risk of injury from moving,  
hot, or electrical parts:  
G Turn off the engine and keep engine  
shut-off cord (lanyard) with you when  
you perform maintenance unless other-  
wise specified.  
2. Spray the outboard motor exterior with  
Yamaha Silicone Protectant.  
3. Wax the cowling with a non-abrasive wax  
such as Yamaha Silicone Wax.  
ECMlUe28a45n1 ing the outboard motor  
After use, wash the exterior of the outboard  
motor with fresh water. Flush the cooling sys-  
tem with fresh water.  
G Allow the engine to cool before handling  
hot parts or fluids.  
G Always completely reassemble the mo-  
tor before operation.  
Maintenance, replacement, or repair of the  
emission control devices and systems  
may be performed by any marine engine  
43  
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Maintenance  
repair establishment or individual. All war-  
ranty repairs, however, including those to  
the emission control system, must be per-  
formed by an authorized Yamaha marine  
dealership.  
A service manual is available for purchase  
through your Yamaha dealer for owners who  
have the mechanical skills, tools, and other  
equipment necessary to perform mainte-  
nance not covered by this owners manual.  
ERMeU2p85l1a1 cement parts  
If replacement parts are necessary, use only  
genuine Yamaha parts or parts of equivalent  
design and quality. Any part of inferior quality  
may malfunction, and the resulting loss of  
control could endanger the operator and pas-  
sengers. Yamaha genuine parts and acces-  
sories are available from your Yamaha  
dealer.  
EMU35520  
Maintenance interval guidelines  
The service intervals provided in the Mainte-  
nance Chart were developed based upon  
typicaluse that includes operating at varied  
speeds, with sufficient time for engine warm  
up and cool-down, a medium to light load, and  
an average cruising speed near the 3000 to  
4000 rpm range. As with any engine, howev-  
er, if your normal operating conditions are dif-  
ferent, you should consider service more  
often than shown, especially how often you  
change your engine and gear oil. Examples  
might include extended wide-open-throttle  
use or long periods of trolling or idling, carry-  
ing heavy loads, or frequent starting and stop-  
ping or shifting. More frequent maintenance  
will often pay off many times over in increased  
engine life and greater owner satisfaction.  
Consult your Yamaha dealer for additional  
maintenance recommendations.  
44  
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Maintenance  
EMU34445  
Maintenance chart 1  
TIP:  
G Refer to the sections in this chapter for explanations of each owner-specific action.  
G The maintenance cycle on these charts assume usage of 100 hours per year and regular  
flushing of the cooling water passages. Maintenance frequency should be adjusted when op-  
erating the engine under adverse conditions such as extended trolling.  
G Disassembly or repairs may be necessary depending on the outcome of maintenance  
checks.  
G Expendable or consumable parts and lubricants will lose their effectiveness over time and  
through normal usage regardless of the warranty period.  
G When operating in salt water, muddy, other turbid (cloudy), acidic water, the engine should  
be flushed with clean water after each use.  
The “ ” symbol indicates the check-ups which you may carry out yourself.  
The “ ” symbol indicates work to be carried out by your Yamaha dealer.  
Initial  
Every  
Item  
Actions  
20 hours 100 hours 300 hours 500 hours  
(3 months) (1 year) (3 years) (5 years)  
Inspection or replace-  
ment as necessary  
Anode(s) (external)  
Anode(s) (cylinder  
head, thermostat cov-  
er)  
Inspection or replace-  
ment as necessary  
Anodes (exhaust cover,  
cooling water passage  
cover, Rectifier Regula-  
tor cover)  
Replacement  
Inspection or replace-  
ment as necessary  
Cooling water leakage  
Cowling lock lever  
Inspection  
Inspection  
Engine starting condi-  
tion/noise  
Engine idling  
speed/noise  
Inspection  
Fuel filter (can be dis-  
assembled)  
Inspection or replace-  
ment as necessary  
Fuel line(High pres-  
sure)  
Inspection  
Fuel line(High pres-  
sure)  
Inspection or replace-  
ment as necessary  
Fuel line(Low pres-  
sure)  
Inspection  
Fuel line(Low pres-  
sure)  
Inspection or replace-  
ment as necessary  
45  
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Maintenance  
Initial  
Every  
Item  
Actions  
20 hours 100 hours 300 hours 500 hours  
(3 months) (1 year) (3 years) (5 years)  
Inspection or replace-  
ment as necessary  
Fuel pump  
Fuel/engine oil leakage Inspection  
Gear oil  
Replacement  
Greasing  
Greasing points  
Impeller/water pump  
housing  
Inspection or replace-  
ment as necessary  
Impeller/water pump  
housing  
Replacement  
Propeller/propeller  
nut/cotter pin  
Inspection or replace-  
ment as necessary  
Inspection, adjustment  
or replacement as nec-  
essary  
Shift link/shift cable  
Inspection or replace-  
ment as necessary  
Spark plug(s)  
Spark plug caps/spark Inspection or replace-  
plug wires  
ment as necessary  
Water from the cooling  
water pilot hole  
Inspection  
Throttle link/throttle ca- Inspection, adjustment  
ble/throttle pick-up tim- or replacement as nec-  
ing  
essary  
Inspection or replace-  
ment as necessary  
Thermostat  
Water inlet  
Inspection  
Main switch/stop  
switch/choke switch  
Inspection or replace-  
ment as necessary  
Wire harness connec-  
tions/wire coupler con-  
nections  
Inspection or replace-  
ment as necessary  
Inspection and clean-  
ing as necessary  
(Yamaha) Fuel tank  
EMU34451  
Maintenance chart 2  
Every  
1000 hours  
Item  
Actions  
Exhaust guide/exhaust Inspection or replace-  
manifold ment as necessary  
46  
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Maintenance  
EMU28932  
Greasing  
Yamaha marine grease (Water resistant grease)  
9.9, 15  
47  
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Maintenance  
ECMlUe28a95n6 ing and adjusting spark plug  
The spark plug is an important engine compo-  
nent and is easy to inspect. The condition of  
the spark plug can indicate something about  
the condition of the engine. For example, if the  
center electrode porcelain is very white, this  
could indicate an intake air leak or carburetion  
problem in that cylinder. Do not attempt to di-  
agnose any problems yourself. Instead, take  
the outboard motor to a Yamaha dealer. You  
should periodically remove and inspect the  
spark plug because heat and deposits will  
cause the spark plug to slowly break down  
and erode.  
1. Spark plug gap  
2. Spark plug part number  
3. Spark plug I.D. mark (NGK)  
Spark plug gap:  
0.91.0 mm (0.0350.039 in)  
1. Remove the spark plug caps from the  
spark plugs.  
4. When fitting the plug, wipe off any dirt  
from the threads, and then screw it in to  
the correct torque.  
2. Remove the spark plug. If electrode ero-  
sion becomes excessive, or if carbon and  
other deposits are excessive, you should  
replace the spark plug with another of the  
correct type. WARNING! When remov-  
ing or installing a spark plug, be care-  
ful not to damage the insulator. A  
damaged insulator could allow exter-  
nal sparks, which could lead to explo-  
Spark plug torque:  
25.0 Nm (2.55 kgf-m, 18.4 ft-lb)  
TIP:  
If a torque-wrench is not available when you  
are fitting a spark plug, a good estimate of the  
correct torque is 1/4 to 1/2 a turn past finger-  
tight. Have the spark plug adjusted to the cor-  
rect torque as soon as possible with a torque-  
wrench.  
sion or fire.  
[EWM00561]  
Standard spark plug:  
B7HS-10  
ECMhU3e74c50king fuel filter  
Check the fuel filter periodically. If any water  
or foreign matter is found in the filter, clean or  
replace it. For cleaning or replacement of the  
fuel filter, consult your Yamaha dealer.  
3. Be sure to use the specified spark plug,  
otherwise the engine may not operate  
properly. Before fitting the spark plug,  
measure the electrode gap with a wire  
thickness gauge; replace it if out of spec-  
ification.  
EInMUs29p04e3 cting idling speed  
EWM00451  
WARNING  
G Do not touch or remove electrical parts  
when starting or during operation.  
48  
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Maintenance  
ECMhU3e21c12king propeller  
G Keep hands, hair, and clothes away from  
the flywheel and other rotating parts  
while the engine is running.  
EWM01881  
WARNING  
ECM00490  
You could be seriously injured if the en-  
gine accidentally starts when you are near  
the propeller. Before inspecting, remov-  
ing, or installing the propeller, place the  
shift control in neutral, turn the main  
NOTICE  
This procedure must be performed while  
the outboard motor is in the water. A flush-  
ing attachment or test tank can be used.  
switch to “  
(off) and remove the key,  
If the boat is not equipped with a tachometer  
for the outboard motor, use a diagnostic ta-  
chometer for this procedure. Results may  
vary depending on whether testing is conduct-  
ed with the flushing attachment, in a test tank,  
or with the outboard motor in the water.  
1. Start the engine and allow it to warm up  
fully in neutral until it is running smoothly.  
2. Once the engine has warmed up, verify  
whether the idle speed is set to specifica-  
tion. For idle speed specifications, see  
page 12. If you have difficulty verifying  
the idle speed, or the idle speed requires  
adjustment, consult a Yamaha dealer or  
other qualified mechanic.  
and remove the clip from the engine shut-  
off switch. Turn off the battery cut-off  
switch if your boat has one.  
Do not use your hand to hold the propeller  
when loosening or tightening the propeller  
nut. Put a wood block between the anti-cavi-  
tation plate and the propeller to prevent the  
propeller from turning.  
ECMhU2e91c13king wiring and connectors  
G Check that each connector is engaged se-  
curely.  
ZMU01897  
G Check that each ground lead is properly se-  
cured.  
Checkpoints  
G Check each of the propeller blades for ero-  
sion from cavitation or ventilation, or other  
damage.  
G Check the propeller shaft for damage.  
G Check the splines for wear or damage.  
G Check for fish line tangled around the pro-  
peller shaft.  
ZMU02087  
49  
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Maintenance  
EInMUs30t6a72lling propeller  
EMU29233  
Spline models  
ECM00500  
NOTICE  
Be sure to use a new cotter pin and bend  
the ends over securely. Otherwise the pro-  
peller could come off during operation and  
be lost.  
1. Apply Yamaha marine grease or a corro-  
sion resistant grease to the propeller  
shaft.  
2. Install the spacer (if equipped), thrust  
washer, washer (if equipped), and pro-  
peller on the propeller shaft. NOTICE: Be  
sure to install the thrust washer before  
installing the propeller, otherwise the  
lower case and propeller boss could  
G Check the propeller shaft oil seal for dam-  
age.  
ERMeU3m066o2 ving propeller  
EMU29197  
Spline models  
1. Straighten the cotter pin and pull it out us-  
ing a pair of pliers.  
2. Remove the propeller nut, washer, and  
spacer (if equipped). WARNING! Do not  
use your hand to hold the propeller  
when loosening the propeller nut.  
[EWM01890]  
be damaged.  
[ECM01880]  
3. Install the spacer (if equipped) and the  
washer. Tighten the propeller nut to the  
specified torque.  
1
Propeller nut tightening torque:  
17.0 Nm (1.73 kgf-m, 12.5 ft-lb)  
4. Align the propeller nut with the propeller  
shaft hole. Insert a new cotter pin in the  
hole and bend the cotter pin ends.  
NOTICE: Do not reuse the cotter pin  
installed. Otherwise the propeller can  
2
3
4
5
ZMU02877  
come off during operation.  
[ECM01890]  
1. Cotter pin  
2. Propeller nut  
3. Washer  
4. Propeller  
5. Thrust washer  
3. Remove the propeller, washer (if  
equipped), and thrust washer.  
50  
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Maintenance  
TIP:  
TIP:  
If the propeller nut does not align with the pro- G If a magnetic gear oil drain screw is  
peller shaft hole after tightening to the speci-  
fied torque, tighten the nut further to align it  
with the hole.  
equipped, remove all metal particles from  
the screw before installing it.  
G Always use new gaskets. Do not reuse the  
removed gaskets.  
4. Remove the oil level plug and gasket to  
allow the oil to drain completely.  
NOTICE: Inspect the used oil after it  
has been drained. If the oil is milky,  
water is getting into the gear case  
which can cause gear damage. Con-  
sult a Yamaha dealer for repair of the  
ECMhU2a92n87ging gear oil  
EWM00800  
WARNING  
G Be sure the outboard motor is securely  
fastened to the transom or a stable  
stand. You could be severely injured if  
the outboard motor falls on you.  
G Never get under the lower unit while it is  
tilted, even when the tilt support lever or  
knob is locked. Severe injury could oc-  
cur if the outboard motor accidentally  
falls.  
lower unit seals.  
[ECM00711]  
TIP:  
For disposal of used oil, consult your Yamaha  
dealer.  
5. Put the outboard motor in a vertical posi-  
tion. Using a flexible or pressurized filling  
device, inject the gear oil into the gear oil  
drain screw hole.  
1. Tilt the outboard motor so that the gear oil  
drain screw is at the lowest point possi-  
ble.  
2. Place a suitable container under the gear  
case.  
3. Remove the gear oil drain screw and gas-  
ket. NOTICE: If there is an excessive  
quantity of metal particles on the mag-  
netic gear oil drain screw, this can in-  
dicate lower unit problem. Consult  
Recommended gear oil:  
Hypoid gear oil SAE#90  
Gear oil quantity:  
0.250 L (0.264 US qt, 0.220 Imp.qt)  
your Yamaha dealer.  
[ECM01900]  
2
ZMU02065  
6. Put a new gasket on the oil level plug.  
When the oil begins to flow out of the oil  
level plug hole, insert and tighten the oil  
level plug.  
1
ZMU02064  
1. Gear oil drain screw  
2. Oil level plug  
51  
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Maintenance  
Tightening torque:  
9.0 Nm (0.92 kgf-m, 6.6 ft-lb)  
7. Put a new gasket on the gear oil drain  
screw. Insert and tighten the gear oil  
drain screw.  
Tightening torque:  
9.0 Nm (0.92 kgf-m, 6.6 ft-lb)  
ECMlUe29a30n2 ing fuel tank  
EWM00920  
WARNING  
Gasoline is highly flammable, and its va-  
pors are flammable and explosive.  
G If you have any question about properly  
doing this procedure, consult your  
Yamaha dealer.  
G Keep away from sparks, cigarettes,  
flames, or other sources of ignition  
when cleaning the fuel tank.  
G Remove the fuel tank from the boat be-  
fore cleaning it. Work only outdoors in  
an area with good ventilation.  
ZMU03231  
3. Remove the screws holding the fuel joint  
assembly. Pull the assembly out of the  
tank.  
G Wipe up any spilled fuel immediately.  
G Reassemble the fuel tank carefully. Im-  
proper assembly can result in a fuel  
leak, which could result in a fire or ex-  
plosion hazard.  
G Dispose of old gasoline according to lo-  
cal regulations.  
1. Empty the fuel tank into an approved con-  
tainer.  
2. Pour a small amount of suitable solvent  
into the tank. Install the cap and shake  
the tank. Drain the solvent completely.  
ZMU02324  
4. Clean the filter (located on the end of the  
suction pipe) in a suitable cleaning sol-  
vent. Allow the filter to dry.  
5. Replace the gasket with a new one. Re-  
install the fuel joint assembly and tighten  
the screws firmly.  
52  
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Maintenance  
EInMUs29p31e2 cting and replacing anode(s)  
Yamaha outboard motors are protected from  
corrosion by sacrificial anodes. Inspect the  
external anodes periodically. Remove scales  
from the surfaces of the anodes. Consult a  
Yamaha dealer for replacement of external  
anodes.  
ECM00720  
NOTICE  
Do not paint anodes, as this would render  
them ineffective.  
TIP:  
Inspect ground leads attached to external an-  
odes on equipped models. Consult a Yamaha  
dealer for inspection and replacement of inter-  
nal anodes attached to the power unit.  
ZMU02067  
53  
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Trouble Recovery  
EMU29427  
Q. Is fuel filter clogged?  
A. Clean or replace filter.  
Troubleshooting  
A problem in the fuel, compression, or ignition  
systems can cause poor starting, loss of pow-  
er, or other problems. This section describes  
basic checks and possible remedies, and cov-  
ers all Yamaha outboard motors. Therefore  
some items may not apply to your model.  
If your outboard motor requires repair, bring it  
to your Yamaha dealer.  
Q. Is starting procedure incorrect?  
A. See page 31.  
Q. Has fuel pump malfunctioned?  
A. Have serviced by a Yamaha dealer.  
Q. Are spark plug(s) fouled or of incorrect  
type?  
A. Inspect spark plug(s). Clean or replace with  
recommended type.  
If the engine trouble-alert indicator is flashing,  
consult your Yamaha dealer.  
Starter will not operate.  
Q. Is battery capacity weak or low?  
A. Check battery condition. Use battery of rec-  
ommended capacity.  
Q. Are spark plug cap(s) fitted incorrectly?  
A. Check and re-fit cap(s).  
Q. Is ignition wiring damaged or poorly con-  
nected?  
A. Check wires for wear or breaks. Tighten all  
loose connections. Replace worn or broken  
wires.  
Q. Are battery connections loose or corrod-  
ed?  
A. Tighten battery cables and clean battery  
terminals.  
Q. Is fuse for electric start relay or electric cir-  
cuit blown?  
A. Check for cause of electric overload and  
repair. Replace fuse with one of correct am-  
perage.  
Q. Are ignition parts faulty?  
A. Have serviced by a Yamaha dealer.  
Q. Is engine shut-off cord (lanyard) not at-  
tached?  
A. Attach cord.  
Q. Are starter components faulty?  
A. Have serviced by a Yamaha dealer.  
Q. Are engine inner parts damaged?  
A. Have serviced by a Yamaha dealer.  
Q. Is shift lever in gear?  
A. Shift to neutral.  
Engine idles irregularly or stalls.  
Q. Are spark plug(s) fouled or of incorrect  
type?  
A. Inspect spark plug(s). Clean or replace with  
recommended type.  
Engine will not start (starter operates).  
Q. Is fuel tank empty?  
A. Fill tank with clean, fresh fuel.  
Q. Is fuel contaminated or stale?  
A. Fill tank with clean, fresh fuel.  
Q. Is fuel system obstructed?  
54  
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Trouble Recovery  
A. Check for pinched or kinked fuel line or oth- A. Return to home position.  
er obstructions in fuel system.  
Q. Is motor angle too high?  
Q. Is fuel contaminated or stale?  
A. Fill tank with clean, fresh fuel.  
A. Return to normal operating position.  
Q. Is carburetor clogged?  
Q. Is fuel filter clogged?  
A. Clean or replace filter.  
A. Have serviced by a Yamaha dealer.  
Q. Is fuel joint connection incorrect?  
A. Connect correctly.  
Q. Have ignition parts failed?  
A. Have serviced by a Yamaha dealer.  
Q. Is throttle valve adjustment incorrect?  
A. Have serviced by a Yamaha dealer.  
Q. Has alert system activated?  
A. Find and correct cause of alert.  
Q. Is battery cable disconnected?  
A. Connect securely.  
Q. Is spark plug gap incorrect?  
A. Inspect and adjust as specified.  
Alert buzzer sounds or indicator lights.  
Q. Is ignition wiring damaged or poorly con- Q. Is cooling system clogged?  
nected?  
A. Check water intake for restriction.  
A. Check wires for wear or breaks. Tighten all  
loose connections. Replace worn or broken Q. Is engine oil level low?  
wires.  
A. Fill oil tank with specified engine oil.  
Q. Is specified engine oil not being used?  
A. Check and replace oil as specified.  
Q. Is heat range of spark plug incorrect?  
A. Inspect spark plug and replace it with rec-  
ommended type.  
Q. Is thermostat faulty or clogged?  
A. Have serviced by a Yamaha dealer.  
Q. Is specified engine oil not being used?  
A. Check and replace oil with specified type.  
Q. Are carburetor adjustments incorrect?  
A. Have serviced by a Yamaha dealer.  
Q. Is engine oil contaminated or deteriorated?  
A. Replace oil with fresh, specified type.  
Q. Is fuel pump damaged?  
A. Have serviced by a Yamaha dealer.  
Q. Is oil filter clogged?  
A. Have serviced by a Yamaha dealer.  
Q. Is air vent screw on fuel tank closed?  
A. Open air vent screw.  
Q. Has oil feed/injection pump malfunc-  
tioned?  
Q. Is choke knob pulled out?  
A. Have serviced by a Yamaha dealer.  
55  
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Trouble Recovery  
Q. Is load on boat improperly distributed?  
A. Remove foreign matter and clean lower  
A. Distribute load to place boat on an even unit.  
plane.  
Q. Is fuel system obstructed?  
Q. Is water pump or thermostat faulty?  
A. Have serviced by a Yamaha dealer.  
A. Check for pinched or kinked fuel line or oth-  
er obstructions in fuel system.  
Q. Is there excess water in fuel filter cup?  
A. Drain filter cup.  
Q. Is fuel filter clogged?  
A. Clean or replace filter.  
Engine power loss.  
Q. Is propeller damaged?  
Q. Is fuel contaminated or stale?  
A. Fill tank with clean, fresh fuel.  
A. Have propeller repaired or replaced.  
Q. Is spark plug gap incorrect?  
Q. Is propeller pitch or diameter incorrect?  
A. Install correct propeller to operate outboard  
at its recommended speed (r/min) range.  
A. Inspect and adjust as specified.  
Q. Is ignition wiring damaged or poorly con-  
nected?  
Q. Is trim angle incorrect?  
A. Check wires for wear or breaks. Tighten all  
A. Adjust trim angle to achieve most efficient loose connections. Replace worn or broken  
operation. wires.  
Q. Is motor mounted at incorrect height on Q. Have electrical parts failed?  
transom?  
A. Have serviced by a Yamaha dealer.  
A. Have motor adjusted to proper transom  
height.  
Q. Is specified fuel not being used?  
A. Replace fuel with specified type.  
Q. Has alert system activated?  
A. Find and correct cause of alert.  
Q. Is specified engine oil not being used?  
A. Check and replace oil with specified type.  
Q. Is boat bottom fouled with marine growth?  
A. Clean boat bottom.  
Q. Is thermostat faulty or clogged?  
A. Have serviced by a Yamaha dealer.  
Q. Are spark plug(s) fouled or of incorrect  
type?  
Q. Is air vent screw closed?  
A. Inspect spark plug(s). Clean or replace with A. Open the air vent screw.  
recommended type.  
Q. Is fuel pump damaged?  
Q. Are weeds or other foreign matter tangled A. Have serviced by a Yamaha dealer.  
on gear housing?  
Q. Is fuel joint connection incorrect?  
56  
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Trouble Recovery  
A. Connect correctly.  
If the outboard motor hits an object in the wa-  
ter, follow the procedure below.  
Q. Is heat range of spark plug incorrect?  
A. Inspect spark plug and replace it with rec-  
ommended type.  
Q. Is high pressure fuel pump drive belt bro-  
ken?  
A. Have serviced by a Yamaha dealer.  
Q. Is engine not responding properly to shift  
lever position?  
A. Have serviced by a Yamaha dealer.  
1. Stop the engine immediately.  
2. Inspect the control system and all compo-  
nents for damage. Also inspect the boat  
for damage.  
Engine vibrates excessively.  
Q. Is propeller damaged?  
A. Have propeller repaired or replaced.  
3. Whether damage is found or not, return  
to the nearest harbor slowly and careful-  
ly.  
Q. Is propeller shaft damaged?  
A. Have serviced by a Yamaha dealer.  
4. Have a Yamaha dealer inspect the out-  
board motor before operating it again.  
ESMtUa29r5t33er will not operate  
If the starter mechanism does not operate  
(the engine cannot be cranked with the start-  
er), the engine can be started with an emer-  
Q. Are weeds or other foreign matter tangled  
on propeller?  
A. Remove and clean propeller.  
Q. Is motor mounting bolt loose?  
A. Tighten bolt.  
gency starter rope.  
EWM01022  
WARNING  
Q. Is steering pivot loose or damaged?  
A. Tighten or have serviced by a Yamaha  
dealer.  
G Use this procedure only in an emergen-  
cy to return to the nearest port for re-  
pairs.  
G When the emergency starter rope is  
used to start the engine, the start-in-  
gear protection device does not operate.  
Make sure the remote control lever is in  
neutral. Otherwise the boat could unex-  
pectedly start to move, which could re-  
sult in an accident.  
ETMeU29m433porary action in emergency  
EImMU2p94a40ct damage  
EWM00870  
WARNING  
The outboard motor can be seriously dam-  
aged by a collision while operating or  
trailering. Damage could make the out-  
board motor unsafe to operate.  
G Attach the engine shut-off cord to a se-  
cure place on your clothing, or your arm  
or leg while operating the boat.  
57  
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Trouble Recovery  
G Do not attach the cord to clothing that  
could tear loose. Do not route the cord  
where it could become entangled, pre-  
venting it from functioning.  
G Avoid accidentally pulling the cord dur-  
ing normal operation. Loss of engine  
power means the loss of most steering  
control. Also, without engine power, the  
boat could slow rapidly. This could  
cause people and objects in the boat to  
be thrown forward.  
G Make sure no one is standing behind  
you when pulling the starter rope. It  
could whip behind you and injure some-  
one.  
G An unguarded, rotating flywheel is very  
dangerous. Keep loose clothing and  
other objects away when starting the en-  
gine. Use the emergency starter rope  
only as instructed. Do not touch the fly-  
wheel or other moving parts when the  
engine is running. Do not install the  
starter mechanism or top cowling after  
the engine is running.  
G Do not touch the ignition coil, spark plug  
wire, spark plug cap, or other electrical  
components when starting or operating  
the motor. You could get an electrical  
shock.  
4. Prepare the engine for starting. For fur-  
ther information, see page 31. Be sure  
the engine is in neutral and that the clip is  
attached to the engine shut-off switch.  
The main switch must be “ ” (on), if  
equipped.  
5. If equipped the choke knob, pull out it  
when the engine is cold. After the engine  
starts, gradually return the choke knob to  
its home position as the engine warms  
up.  
6. Insert the knotted end of the emergency  
starter rope into the notch in the flywheel  
rotor and wind the rope several turns  
around the flywheel clockwise.  
7. Give a strong pull straight out to crank  
and start the engine. Repeat if neces-  
sary.  
EEMmU29e56r2gency starting engine  
1. Remove the top cowling.  
2. Remove the start-in-gear protection ca-  
ble from the starter, if equipped.  
3. Remove the starter/flywheel cover after  
removing the bolt(s).  
58  
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Trouble Recovery  
EMU33501  
Treatment of submerged motor  
If the outboard motor is submerged, immedi-  
ately take it to a Yamaha dealer. Otherwise  
some corrosion may begin almost immediate-  
ly. NOTICE: Do not attempt to run the out-  
board motor until it has been completely  
inspected.  
[ECM00401]  
59  
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Consumer information  
EMU29820  
YAMAHA MOTOR CORPORATION, U.S.A.  
OUTBOARD MOTOR TWO YEAR LIMITED WARRANTY  
60  
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Consumer information  
61  
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Consumer information  
62  
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Consumer information  
EMU2I98M41 PORTANT WARRANTY INFORMATION IF YOU USE YOUR  
YAMAHA OUTSIDE THE USA OR CANADA  
63  
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