Yamaha Outboard Motor 6L2 28199 1L User Manual

25D  
OWNER’S MANUAL  
U.S.A.Edition  
LIT-18626-05-83  
6L2-28199-1L  
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Important manual information  
EMU25100  
al, please consult your Yamaha dealer.  
To the owner  
NOTE:  
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 ob-  
tain 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.  
In this Owner’s Manual particularly important  
information is distinguished in the following  
ways.  
The 25MH and the standard accessories are  
used as a base for the explanations and illus-  
trations in this manual. Therefore some  
items may not apply to every model.  
EMU25110  
25D  
OWNER’S MANUAL  
©2004 byYamaha Motor Corporation, USA  
1st edition, March 2004  
All rights reserved.  
Any reprinting or unauthorized use  
without the written permission of  
Yamaha Motor Corporation, USA  
is expressly prohibited.  
The Safety Alert Symbol means  
ATTENTION! BECOME ALERT! YOUR  
SAFETY IS INVOLVED!  
Printed in Japan  
EWM00780  
P/N LIT-18626-05-83  
WARNING  
Failure to follow WARNING instructions  
could result in severe injury or death to  
the machine operator, a bystander, or a  
person inspecting or repairing the out-  
board motor.  
ECM00700  
CAUTION:  
A CAUTION indicates special precautions  
that must be taken to avoid damage to the  
outboard motor.  
NOTE:  
A NOTE provides key information to make  
procedures easier or clearer.  
Yamaha continually seeks advancements in  
product design and quality. Therefore, while  
this manual contains the most current prod-  
uct information available at the time of print-  
ing, there may be minor discrepancies  
between your machine and this manual. If  
there is any question concerning this manu-  
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Table of contents  
General information ..........................1 Operation......................................... 17  
Identification numbers record...........1  
Outboard motor serial number.......... 1  
Emission control information............1  
North American models..................... 1  
Safety information ............................2  
Important labels................................3  
Warning labels .................................. 3  
Installation...................................... 17  
Mounting the outboard motor..........17  
Clamping the outboard motor..........18  
Breaking in engine......................... 19  
Gasoline and engine oil mixing  
chart (25:1)....................................19  
Procedure for pre-mixed models.....19  
Preoperation checks...................... 20  
Fuel .................................................20  
Oil....................................................20  
Controls...........................................20  
Engine.............................................20  
Filling fuel and engine oil ............... 20  
Filling fuel for portable tank.............20  
Ring Free Fuel Additive...................21  
Gasoline and oil mixing (100:1).......21  
Operating engine ........................... 22  
Feeding fuel (portable tank) ............22  
Starting engine................................23  
Warming up engine........................ 25  
Choke start models .........................25  
Shifting........................................... 25  
Forward (tiller handle and remote  
Basic boating rules  
(Rules of the road) .........................4  
Steering and sailing rules and sound  
signals............................................. 4  
Rules when encountering vessels .... 4  
Other special situations..................... 5  
Fueling instructions ..........................7  
Gasoline............................................ 8  
Engine oil .......................................... 8  
Propeller selection............................8  
Start-in-gear protection ....................9  
Basic components ..........................10  
Main components...........................10  
Fuel tank ......................................... 10  
Fuel joint ......................................... 11  
Fuel gauge...................................... 11  
Fuel tank cap .................................. 11  
Air vent screw ................................. 11  
Tiller handle .................................... 11  
Gear shift lever................................ 11  
Throttle grip..................................... 11  
Throttle indicator ............................. 12  
Throttle friction adjuster................... 12  
Engine stop lanyard switch ............. 12  
Engine stop button.......................... 13  
Choke knob for pull type ................. 13  
Manual starter handle ..................... 13  
Steering friction adjuster ................. 13  
Trim tab with anode ........................ 14  
Trim rod (tilt pin).............................. 14  
Shallow water lever......................... 14  
Tilt lock mechanism......................... 15  
Tilt support bar................................ 15  
Top cowling lock lever(s)  
control models) .............................25  
Reverse (manual tilt and hydro tilt  
models) .........................................26  
Stopping engine............................. 26  
Procedure........................................26  
Trimming outboard motor............... 27  
Adjusting trim angle for manual tilt  
models ..........................................28  
Adjusting boat trim ..........................28  
Tilting up and down........................ 29  
Procedure for tilting up....................30  
Procedure for tilting down  
(manual tilt models).......................30  
Cruising in shallow water ............... 31  
Cruising in shallow water  
(manual tilt models).......................31  
Cruising in other conditions............ 32  
Maintenance .................................... 33  
(turn type) ..................................... 15  
Warning system .............................15  
Overheat warning............................ 15  
Specifications................................. 33  
Transporting and storing outboard  
motor............................................ 33  
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Table of contents  
Clamp screw mounting models....... 34  
Storing outboard motor ................... 34  
Procedure ....................................... 35  
Lubrication  
IMPORTANT WARRANTY  
INFORMATION IF YOU USE  
YOUR YAMAHA OUTSIDE  
U.S.A. OR CANADA.................... 60  
(except oil injection models) ......... 36  
Cleaning and anticorrosion  
measures...................................... 36  
Cleaning the outboard motor .......... 36  
Checking painted surface of  
motor............................................. 36  
Periodic maintenance.....................37  
Replacement parts.......................... 37  
Maintenance chart .......................... 38  
Greasing ......................................... 39  
Cleaning and adjusting spark plug.. 39  
Checking fuel system...................... 40  
Inspecting fuel filter......................... 41  
Cleaning fuel filter ........................... 41  
Inspecting idling speed ................... 42  
Checking wiring and connectors..... 42  
Exhaust leakage ............................. 42  
Water leakage................................. 42  
Checking propeller.......................... 43  
Removing the propeller................... 44  
Installing the propeller..................... 44  
Changing gear oil............................ 44  
Cleaning fuel tank ........................... 45  
Inspecting and replacing anode(s).. 46  
Checking top cowling...................... 46  
Coating the boat bottom.................. 46  
Trouble Recovery............................48  
Troubleshooting .............................48  
Temporary action in emergency.....51  
Impact damage ............................... 51  
Starter will not operate.................... 51  
Emergency starting engine ............. 52  
Treatment of submerged motor......53  
Procedure ....................................... 53  
Consumer information....................55  
Important warranty information for  
U.S.A. and Canada ......................55  
YAMAHA MOTOR  
CORPORATION, U.S.A.  
OUTBOARD MOTOR TWO  
YEAR LIMITED WARRANTY.......57  
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General information  
EMU25170  
engine for details.  
EMU30390  
Identification numbers record  
EMU25182  
Approval label of emission control certif-  
icate  
This label is attached to the bottom cowling.  
Outboard motor serial number  
The outboard motor serial number is  
stamped on the label attached to the port  
side of the clamp bracket or the upper part of  
the swivel 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.  
Existing Technology; N/A  
1
ZMU04828  
1. Approval label location  
EMISSION CONTROL INFORMATION  
ENGINE FAMILY :  
THIS ENGINE CONFORMS TO 21 U.S. EPA REGULATIONS FOR MARINE SI ENGINES.  
REFER TO THE OWNERS MANUAL FOR MAINTENANCE SPECIFICATIONS AND ADJUSTMENTS.  
g/kw-hr  
FELs :  
IDLE SPEED :  
rpm IN NEUTRAL  
SPARK PLUG :  
SPARK PLUG GAP (mm) :  
3
DISPLACEMENT :  
ADVERTISED POWER :  
cm  
kw  
FUEL : GASOLINE  
1. Outboard motor serial number location  
IN  
EX  
VALVE LASH (mm) :  
ZMU04304  
EMU25261  
Manufactured date label  
This label is attached to the clamp bracket or  
the swivel bracket.  
EMU25220  
Emission control information  
EMU25230  
North American models  
This engine conforms to U.S. Environmental  
Protection Agency (EPA) regulations for ma-  
rine SI engines. See the label affixed to your  
1
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General information  
G Do not modify the outboard. Modifications  
could make the motor unfit or unsafe to  
use.  
G Never operate after drinking alcohol or tak-  
ing drugs. About 50% of all boating fatali-  
ties involve intoxication.  
G Have an approved personal flotation de-  
vice (PFD) on board for every occupant. It  
is a good idea to 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.  
1
ZMU04125  
1. Manufactured date label location  
G Gasoline is highly flammable, and its va-  
pors are flammable and explosive. Handle  
and store gasoline carefully. Make sure  
there are no gas fumes or leaking fuel be-  
fore starting the engine.  
G This product emits exhaust gases which  
contain carbon monoxide, a colorless,  
odorless gas which may cause brain dam-  
age or death when inhaled. Symptoms in-  
clude nausea, dizziness, and drowsiness.  
Keep cockpit and cabin areas well ventilat-  
ed. Avoid blocking exhaust outlets.  
G Check throttle, shift, and steering for prop-  
er operation before starting the engine.  
G Attach the engine stop switch lanyard cord  
to a secure place on your clothing, or your  
arm or leg while operating. If you acciden-  
tally leave the helm, the cord will pull from  
the switch, stopping the engine.  
G Know the marine laws and regulations  
where you will be boating—and obey  
them. For basic boating rules, see “Rules  
of the road” on page 4.  
G Stay informed about the weather. Check  
weather forecasts before boating. Avoid  
boating in hazardous weather.  
EMU25361  
Safety information  
G Before mounting or operating the outboard  
motor, read this entire manual. Reading it  
should give you an understanding of the  
motor and its operation.  
G Before operating the boat, read any own-  
er’s or operator’s manuals supplied with it  
and all labels. Be sure you understand  
each item before operating.  
G Do not overpower the boat with this out-  
board motor. Overpowering the boat could  
result in loss of control. The rated power of  
the outboard should be equal to or less  
than the rated horsepower capacity of the  
boat. If the rated horsepower capacity of  
the boat is unknown, consult the dealer or  
boat manufacturer.  
G Tell someone where you are going: leave  
2
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General information  
EMU25380  
EMU25395  
a Float Plan with a responsible person. Be  
sure to cancel the Float Plan when you re-  
turn.  
Important labels  
Warning labels  
G Use common sense and good judgment  
when boating. Know your abilities, and be  
sure you understand how your boat han-  
dles under the different boating conditions  
you may encounter. Operate within your  
limits, and the limits of your boat. Always  
operate at safe speeds, and keep a careful  
watch for obstacles and other traffic.  
G Always watch carefully for swimmers dur-  
ing the engine operation.  
ZMU04780  
G Stay away from swimming areas.  
G When a swimmer is in the water near you  
shift into neutral and shut off the engine.  
Be informed about boating safety. Additional  
publications and information can be obtained  
from many organizations, including the fol-  
lowing:  
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  
ZMU03684  
EMU25401  
Label  
EWM01260  
Boating Safety Hotline: 1-800-368-5647  
National Marine Manufacturers Associa-  
tion (NMMA)  
401 N. Michigan Ave.  
Chicago, Il 60611  
Marine Retailers Association of America  
155 N. Michigan Ave.  
Chicago, Il 60601  
WARNING  
G Be sure shift control is in neutral before  
starting engine. (except 2HP)  
G Do not touch or remove electrical parts  
when starting or during operation.  
G Keep hands, hair, and clothes away  
from flywheel and other rotating parts  
while engine is running.  
EMU25431  
Label  
EWM01300  
WARNING  
G This engine is equipped with a neutral  
starting device.  
G The engine will not start unless the shift  
3
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General information  
control is in neutral position.  
Give-way vessel  
The vessel which 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  
vessel. Normally, you should not cross in  
front of the vessel with the right-of-way. You  
should slow down or change directions brief-  
ly and pass behind the other vessel. You  
should always move in such a way that the  
operator of the other vessel can see what  
you are doing.  
EMU25500  
Basic boating rules (Rules of  
the road)  
Just as there are rules which apply when you  
are driving on streets and high ways, there  
are waterway rules which apply when you  
are driving your boat. These rules are used  
internationally, and are also enforced by the  
United States Coast Guard and local agen-  
cies. You should be aware of these rules,  
and follow them whenever you encounter  
another vessel on the water.  
“The general prudential rule”  
This rule is called Rule 2 in the International  
Rules and says,  
Several sets of rules prevail according to  
geographic location, but are all basically the  
same as the International Rules of the Road.  
The rules presented here in your Owner’s  
Manual are condensed, and have been pro-  
vided for your convenience only. Consult  
your local U.S. Coast Guard Auxiliary or De-  
partment of Motor Vehicles for a complete  
set of rules governing the waters in which  
“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-  
you will be using your boat.  
EMU25510  
sels.  
EMU25520  
Steering and sailing rules and sound  
signals  
Rules when encountering vessels  
There are three main situations which you  
may encounter with other vessels which  
could lead to a collision unless the Steering  
Rules are followed:  
Meeting: (you are approaching another ves-  
sel head-on)  
Crossing: (you are traveling across the oth-  
er vessel’s path)  
Whenever two vessels on the water meet  
one another, one vessel has the right-of-  
way; it is called the “stand-on” vessel. The  
vessel which does not have the right-of-way  
is called the “give-way” or “burdened” vessel.  
These rules determine which vessel has the  
right-of-way, and what each vessel should  
do.  
Stand-on vessel  
Overtaking: (you are passing or being  
passed by another 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  
maintain your direction and speed, the other  
vessel will be able to determine how best to  
avoid you.  
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 shad-  
ed area must yield to you (they are the Give-  
4
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General information  
Way vessels). Both you and the meeting tion, provided the other vessel gives you the  
vessel must alter course to avoid each other. right-of-way as it should.  
Meeting  
Overtaking  
If you are meeting another power vessel If you are passing another vessel, you are  
head on, and are close enough to run the risk the “Give-Way” vessel. This means that the  
of collision, neither of you has the right-of- other vessel is expected to maintain its  
way! Both of you should alter course to avoid course and speed. You must stay out of its  
an accident. You should keep the other ves- way until you are clear of it. Likewise, if an-  
sel on your port (left) side. This rule doesn’t other vessel is passing you, you should  
apply if both of you will clear one another if maintain your speed and direction so that the  
you continue on your set course and speed. other vessel can steer itself around you.  
EMU25530  
Other special situations  
There are three other rules you should be  
aware of when driving your boat around oth-  
er 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 wa-  
Crossing  
ter vessels, the operator should sound a pro-  
When two power driven vessels are crossing  
longed blast on the whistle (4 to 6 seconds).  
each other’s path close enough to run the  
If another vessel is around the bend, it too  
risk of collision, the vessel which has the oth-  
should sound the whistle. Even if no reply is  
er on the starboard (right) side must keep out  
heard, however, the vessel should still pro-  
of the way of the other. If the other vessel is  
ceed around the bend with caution. If you  
on your right, you must keep out of its way;  
navigate such waters with your boat, you will  
you are the Give-Way vessel. If the other  
need to carry a portable air horn, available  
vessel is on your port (left) side, remember  
that you should maintain course and direc-  
from local marine supply stores.  
5
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General information  
Fishing vessel right-of-way  
state. The Uniform State Waterway Marking  
System has been devised for these waters.  
This system uses buoys and signs with dis-  
tinctive shapes and colors to show regulato-  
ry or advisory information. These markers  
are white with black letters and orange  
boarders. They signify speed zones, restrict-  
ed areas, danger areas, and general infor-  
mation.  
All vessels which are fishing with nets, lines  
or trawls are considered to be “fishing ves-  
sels” under the International Rules. Vessels  
with trolling lines are not considered fishing  
vessels. Fishing vessels have the right-of-  
way regardless of position. Fishing vessels  
cannot, however, impede the passage of  
other vessels in narrow channels.  
Sailing vessel right-of-way  
Remember, markings may vary by geo-  
graphic location. Always consult local boat-  
ing authorities before driving your boat in  
unfamiliar waters.  
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-driv-  
en 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 which can navi-  
gate 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,  
numbers and lights to show which side of the  
buoy a boater should pass on when navigat-  
ing in a particular direction. The markings on  
these buoys are oriented from the perspec-  
tive of being entered from seaward (the boat-  
er is going towards the port). This means that  
red buoys are passed on the starboard  
(right) side when proceeding from open wa-  
ter into port, and black buoys are to port (left)  
side. When navigating out of port, your posi-  
tion with respect to the buoys should be re-  
versed; red buoys should be to port and  
black buoys to starboard.  
Many bodies of water used by boaters are  
entirely within the boundaries of a particular  
6
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General information  
ZMU01708  
EMU25540  
away from sparks, flames, or other  
Fueling instructions  
sources of ignition.  
EWM00010  
G Stop engine before refueling.  
G Refuel in a well-ventilated area. Refuel  
portable fuel tanks off the boat.  
G Take care not to spill gasoline. If gaso-  
line spills, wipe it up immediately with  
WARNING  
GASOLINE AND ITS VAPORS ARE HIGH-  
LY FLAMMABLE AND EXPLOSIVE!  
G Do not smoke when refueling, and keep  
7
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General information  
EMU25650  
dry rags.  
Engine oil  
G Do not overfill the fuel tank.  
G Tighten the filler cap securely after re-  
fueling.  
G If you should swallow some gasoline,  
inhale a lot of gasoline vapor, or get  
gasoline in your eyes, get immediate  
medical attention.  
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  
G If any gasoline spills onto your skin, im-  
mediately wash with soap and water.  
Change clothing if gasoline spills on it.  
G Touch the fuel nozzle to the filler open-  
ing or funnel to help prevent electro-  
static sparks.  
NMMA-certified TC-W3 rating may be used.  
EMU25741  
Propeller selection  
The performance of your outboard motor will  
be critically affected by your choice of propel-  
ler, as an incorrect choice could adversely  
affect performance and could also seriously  
damage the motor. Engine speed depends  
on the propeller size and boat load. If engine  
speed is too high or too low for good engine  
performance, this will have an adverse effect  
on the engine.  
ECM00010  
CAUTION:  
Use only new clean gasoline which has  
been stored in clean containers and is not  
contaminated with water or foreign mat-  
ter.  
Yamaha outboard motors are fitted with pro-  
pellers chosen to perform well over a range  
of applications, but there may be uses where  
a propeller with a different pitch would be  
more appropriate. For a greater operating  
load, a smaller-pitch propeller is more suit-  
able as it enables the correct engine speed  
to be maintained. Conversely, a larger-pitch  
propeller is more suitable for a smaller oper-  
ating load.  
EMU25570  
Gasoline  
If knocking or pinging occurs, use a different  
brand of gasoline or premium unleaded fuel.  
Recommended gasoline:  
Regular unleaded gasoline with a min-  
imum octane rating of 86 (Pump Oc-  
tane Number) = (R+M)/2  
Gasohol  
Yamaha dealers stock a range of propellers,  
and can advise you and install a propeller on  
your outboard that is best suited to your ap-  
plication.  
There are two types of gasohol: gasohol con-  
taining ethanol and that containing metha-  
nol. Gasohol containing ethanol can be used  
if ethanol content does not exceed 10% and  
the fuel meets minimum octane ratings.  
Yamaha does not recommended gasohol  
containing methanol because it can cause  
fuel system damage or engine performance  
problems.  
8
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General information  
x
-
1
2 3  
ZMU04605  
1. Propeller diameter in inches  
2. Propeller pitch in inches  
3. Type of propeller (propeller mark)  
NOTE:  
Select a propeller which will allow the engine  
to reach the middle or upper half of the oper-  
ating range at full throttle with the maximum  
boat load. If operating conditions such as  
light boat loads then allow the engine r/min to  
rise above the maximum recommended  
range, reduce the throttle setting to maintain  
the engine in the proper operating range.  
For instructions on propeller removal and in-  
stallation, see page 43.  
EMU25770  
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.  
9
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Basic components  
EMU25795  
Main components  
NOTE:  
* May not be exactly as shown; also may not be included as standard equipment on all mod-  
els.  
25D  
1
2
3
17  
4
5
6
7
16  
15  
18  
14  
9
13  
12  
8
10  
11  
ZMU04829  
1. Top cowling lock lever  
2. Choke knob  
3. Gear shift lever  
14. Clamp bracket  
15. Rope attachment  
16. Shallow water lever  
17. Top cowling  
4. Tiller handle  
5. Throttle friction adjuster  
18. Fuel tank*  
6. Engine stop button/Engine stop lanyard  
switch  
EMU25802  
Fuel tank  
7. Transom clamp handle  
8. Tilt lock lever  
If your model was equipped with a portable  
9. Trim rod  
10. Cooling water inlet  
11. Propeller  
12. Trim tab (anode)  
13. Anti-cavitation plate  
fuel tank, its function is as follows.  
EWM00020  
WARNING  
The fuel tank supplied with this engine is  
its dedicated fuel reservoir and must not  
10  
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Basic components  
be used as a fuel storage container. Com-  
mercial users should conform to relevant  
licensing or approval authority regula-  
tions.  
1
3
4
2
ZMU02846  
EMU25922  
Gear shift lever  
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.  
ZMU03157  
1. Fuel joint  
2. Fuel gauge  
3. Fuel tank cap  
4. Air vent screw  
R
3
N
2
EMU25830  
Fuel joint  
This joint is used to connect the fuel line.  
EMU25841  
F
1
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  
ZMU03687  
tank.  
1. Forward “ ”  
2. Neutral “ ”  
3. Reverse “ ”  
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.  
EMU25860  
EMU25941  
Throttle grip  
The throttle grip is on the tiller handle. Turn  
the grip counterclockwise to increase speed  
and clockwise to decrease speed.  
Air vent screw  
This screw is on the fuel tank cap. To loosen  
the screw, turn it counterclockwise.  
EMU25911  
Tiller handle  
To change direction, move the tiller handle to  
the left or right as necessary.  
11  
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Basic components  
there is too much resistance, it could be  
difficult to move throttle lever or grip,  
which could result in an accident.  
ZMU02848  
EMU25961  
Throttle indicator  
The fuel consumption curve on the throttle  
indicator shows the relative amount of fuel  
consumed for each throttle position. Choose  
the setting that offers the best performance  
and fuel economy for the desired operation.  
ZMU03688  
When constant speed is desired, tighten the  
adjuster to maintain the desired throttle set-  
ting.  
EMU25990  
Engine stop lanyard switch  
The lock plate must be attached to the en-  
gine stop switch for the engine to run. The  
lanyard should be attached to a secure place  
on the operator’s clothing, or arm or leg.  
Should the operator fall overboard or leave  
the helm, the lanyard will pull out the lock  
plate, stopping ignition to the engine. This  
will prevent the boat from running away un-  
1
ZMU02849  
der power.  
EWM00120  
1. Throttle indicator  
WARNING  
EMU25970  
G Attach the engine stop switch lanyard  
to a secure place on your clothing, or  
your arm or leg while operating.  
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  
G Do not attach the lanyard to clothing  
that could tear loose. Do not route the  
lanyard where it could become entan-  
gled, preventing it from functioning.  
G Avoid accidentally pulling the lanyard  
during normal operation. Loss of en-  
gine power means the loss of most  
steering control. Also, without engine  
power, the boat could slow rapidly. This  
adjuster counterclockwise.  
EWM00030  
WARNING  
Do not overtighten the friction adjuster. If  
12  
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Basic components  
could cause people and objects in the  
boat to be thrown forward.  
NOTE:  
The engine cannot be started with the lock  
plate removed.  
ZMU04127  
EMU26070  
Manual starter handle  
To start the engine, first gently pull the han-  
dle out until resistance is felt. From that posi-  
tion, then pull the handle straight out quickly  
to crank the engine.  
2
1
ZMU03689  
1. Lanyard  
2. Lock plate  
EMU26001  
Engine stop button  
To open the ignition circuit and stop the en-  
gine, push this button.  
EMU26122  
Steering 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.  
ZMU03690  
EMU26011  
Choke knob for pull type  
To supply the engine with the rich fuel mix-  
ture required to start, pull out this knob.  
13  
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Basic components  
starboard side “B” in the figure.  
ECM00840  
CAUTION:  
The trim tab also serves as an anode to  
protect the engine from electrochemical  
corrosion. Never paint the trim tab as it  
will become ineffective as an anode.  
ZMU02908  
A
1
To increase resistance, turn the adjuster  
clockwise.  
To decrease resistance, turn the adjuster  
counterclockwise.  
EWM00040  
B
2
WARNING  
ZMU02822  
Do not overtighten the friction adjuster. If  
there is too much resistance, it could be  
difficult to steer, which could result in an  
accident.  
1. Trim tab  
2. Bolt  
EMU26261  
EMU26240  
Trim rod (tilt pin)  
Trim tab with anode  
The position of the trim rod determines the  
minimum trim angle of the outboard motor in  
relation to the transom.  
The trim tab should be adjusted so that the  
steering control can be turned to either the  
right or left by applying the same amount of  
force.  
EWM00840  
WARNING  
An improperly adjusted trim tab could  
cause difficult steering. Always test run  
after the trim tab has been installed or re-  
placed to be sure steering is correct. Be  
sure you have tightened the bolt after ad-  
justing the trim tab.  
ZMU02929  
If the boat tends to veer the left (port side),  
turn the trim tab rear end to the port side “A”  
in the figure. If the boat tends to veer the right  
(starboard side), turn the trim tab end to the  
EMU26270  
Shallow water lever  
Lifting this lever will tilt the motor up partially  
to provide more clearance when operating in  
shallow water.  
14  
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Basic components  
ZMU04111  
ZMU03699  
EMU30530  
EMU26372  
Tilt lock mechanism  
Top cowling lock lever(s) (turn type)  
The tilt lock mechanism is used to prevent To remove the engine top cowling, turn the  
the outboard motor from lifting out of the wa- lock lever(s) and lift off the cowling. When in-  
ter when in reverse gear.  
stalling the cowling, check to be sure it fits  
properly in the rubber seal. Then lock the  
cowling again by returning the lever(s) to the  
lock position.  
1
ZMU03695  
1. Tilt lock lever  
ZMU03701  
1
To lock it, set the tilt lock lever in the lock po-  
sition. To release, push the tilt lock lever in  
1. Top cowling lock lever(s)  
the release position.  
EMU26330  
EMU26801  
Tilt support bar  
The tilt support bar keeps the outboard motor  
Warning system  
ECM00090  
CAUTION:  
in the tilted up position.  
Do not continue to operate the engine if a  
warning device has activated. Consult  
your Yamaha dealer if the problem can-  
not be located and corrected.  
EMU26813  
Overheat warning  
This engine has an overheat warning device.  
15  
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Basic components  
If the engine temperature rises too high, the  
warning device will activate.  
Activation of warning device  
G The engine speed will automatically de-  
crease to about 2000 r/min.  
G The overheat warning indicator will light (if  
equipped on the bottom cowling or the ta-  
chometer).  
G The buzzer will sound (if equipped on the  
tiller handle, remote control box, or main  
switch panel).  
If the warning system has activated, stop the  
engine and check the cooling water inlet for  
clogging.  
16  
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Operation  
EMU26901  
specific boat and motor combination.  
Installation  
EWM00830  
ECM00110  
WARNING  
CAUTION:  
Improper mounting of the outboard mo-  
tor could result in hazardous conditions  
such as poor handling, loss of control, or  
fire hazards. Observe the following:  
G For permanently mounted models, your  
dealer or other person experienced in  
proper rigging should mount the motor.  
If you are mounting the motor yourself,  
you should be trained by an experi-  
enced person.  
Incorrect engine height or obstructions  
to smooth water flow (such as the design  
or condition of the boat, or accessories  
such as transom ladders or depth finder  
transducers) can create airborne water  
spray while the boat is cruising. Severe  
engine damage may result if the motor is  
operated continuously in the presence of  
airborne water spray.  
G For portable models, your dealer or oth-  
er person experienced in proper out-  
board motor mounting should show  
you how to mount your motor.  
NOTE:  
During water testing check the buoyancy of  
the boat, at rest, with its maximum load.  
Check that the static water level on the ex-  
haust housing is low enough to prevent wa-  
ter entry into the powerhead, when water  
rises due to waves when the outboard is not  
running.  
Mount the outboard motor on the center line  
(keel line) of the boat, and ensure that the  
boat itself is well balanced. Otherwise the  
boat will be hard to steer. For boats without  
a keel or which are asymmetrical, consult  
your dealer.  
EMU26910  
Mounting the outboard motor  
EWM00820  
WARNING  
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 capac-  
ity plate of the boat. If the boat does not  
have a capacity plate, consult the boat  
manufacturer.  
G The information presented in this sec-  
tion is intended as reference only. It is  
not possible to provide complete in-  
structions for every possible boat and  
motor combination. Proper mounting  
depends in part on experience and the  
1
ZMU01760  
1. Center line (keel line)  
EMU26920  
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  
17  
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Operation  
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.  
come loose due to engine vibration.  
EWM00640  
WARNING  
Loose clamp screws could allow the out-  
board motor to fall off or move on the  
transom. This could cause loss of control  
and serious injury. Make sure the tran-  
som screws are tightened securely. Oc-  
casionally check the screws for tightness  
during operation.  
0–25mm  
ZMU02012  
(0–1in.)  
ZMU02011  
2. If the engine restraint cable attachment  
is equipped on your engine, an engine  
restraint cable or chain should be used.  
Attach one end to the engine restraint  
cable attachment and the other to a se-  
cure mounting point on the boat. Other-  
wise the engine could be completely lost  
if it accidentally falls off the transom.  
NOTE:  
G The optimum mounting height of the out-  
board motor is affected by the boat and  
motor combination and the desired use.  
Test runs at different heights can help de-  
termine the optimum mounting height.  
Consult your Yamaha dealer or boat man-  
ufacturer for further information on deter-  
mining the proper mounting height.  
G For instructions on setting the trim angle of  
the outboard motor, see page 27.  
EMU26970  
Clamping the outboard motor  
1. Place the outboard motor on the tran-  
som so that it is positioned as close to  
the center as possible. Tighten the tran-  
som clamp screws evenly and securely.  
Occasionally check the clamp screws  
for tightness during operation of the out-  
board motor because they could be-  
ZMU02013  
3. Secure the clamp bracket to the transom  
using the bolts provided with the out-  
18  
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Operation  
EMU27050  
board (if packed). For details, consult  
Gasoline and engine oil mixing chart  
(25:1)  
your Yamaha dealer.  
EWM00650  
WARNING  
Avoid using bolts, nuts or washers other  
than those contained in the engine pack-  
aging. If used, they must be of at least the  
same quality of material and strength and  
must be tightened securely. After tighten-  
ing, test run the engine and check their  
tightness.  
1. : Gasoline  
2. : Engine oil  
ECM00150  
CAUTION:  
Be sure to mix gasoline and oil complete-  
ly, otherwise the engine may be dam-  
aged.  
1
EMU27073  
ZMU02637  
Procedure for pre-mixed models  
Run the engine under load (in gear with a  
propeller installed) as follows.  
1. Bolts  
1. First 10 minutes:  
EMU30172  
Run the engine at the lowest possible  
speed. A fast idle in neutral is best.  
2. Next 50 minutes:  
Breaking 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  
Do not exceed half throttle (approxi-  
mately 3000 r/min). Vary engine speed  
occasionally. If you have an easy-plan-  
ing boat, accelerate at full throttle onto  
plane, then immediately reduce the  
throttle to 3000 r/min or less.  
life.  
ECM00800  
CAUTION:  
Failure to follow the break-in procedure  
could result in reduced engine life or  
even severe engine damage.  
3. Second hour:  
Accelerate at full throttle onto plane,  
then reduce engine speed to three-quar-  
ter 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  
19  
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Operation  
EMU27120  
cool.  
Oil  
4. Third through tenth hours:  
Avoid operating at full throttle for more  
than 5 minutes at a time. Let the engine  
cool between full-throttle runs. Vary en-  
gine speed occasionally.  
G Check to be sure you have plenty of oil for  
your trip.  
EMU27130  
Controls  
G Check throttle, shift, and steering for prop-  
er operation before starting the engine.  
G The controls should work smoothly, with-  
out binding or unusual free play.  
G Look for loose or damaged connections.  
G Check operation of the starter and stop  
switches when the outboard motor is in the  
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 20.  
EMU27101  
Preoperation checks  
water.  
EMU27140  
EWM00080  
WARNING  
Engine  
If any item in the preoperation check is  
not working properly, have it inspected  
and repaired before operating the out-  
board motor. Otherwise an accident  
could occur.  
G Check the engine and engine mounting.  
G Look for loose or damaged fasteners.  
G Check the propeller for damage.  
EMU27233  
Filling fuel and engine oil  
EMU27242  
ECM00120  
Filling fuel for portable tank  
CAUTION:  
EWM00060  
Do not start the engine out of water. Over-  
heating and serious engine damage can  
occur.  
WARNING  
Gasoline and its vapors are highly flam-  
mable and explosive. Keep away from  
sparks, cigarettes, flames, or other  
sources of ignition.  
EMU27110  
Fuel  
G Check to be sure you have plenty of fuel  
1. Remove the fuel tank cap.  
2. Fill the fuel tank carefully.  
3. Close the cap securely after refueling.  
Wipe up any spilled fuel.  
for your trip.  
G Make sure there are no fuel leaks or gaso-  
line fumes.  
G Check fuel line connections to be sure they  
are tight (if equipped Yamaha fuel tank or  
boat tank).  
G Be sure the fuel tank is positioned on a se-  
cure, flat surface, and that the fuel line is  
not twisted or flattened, or likely to contact  
sharp objects (if equipped Yamaha fuel  
tank or boat tank).  
Fuel tank capacity (if equipped Yamaha  
fuel tank):  
24L  
20  
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Operation  
EMU27403  
Gasoline and oil mixing (100:1)  
Gasoline to engine  
oil ratio  
Break-in period  
After break-in  
See page 19  
100:1  
If equipped with a portable fuel tank  
1. Pour oil into the portable fuel tank, and  
then add gasoline.  
ZMU03012  
EMU27270  
Ring Free Fuel Additive  
Gasoline is a precise blend of many different  
substances, each chosen to give certain  
characteristics. Gasoline blends have been  
changing in recent years in response to con-  
cerns about pollution and resulting emis-  
sions regulations. One of the most obvious  
changes has been the elimination of lead  
from most fuels.  
As gasoline has changed, the amount of ad-  
ditives such as aromatics and oxygenates  
has increased. These additives are impor-  
tant for the engines in passenger cars, but  
they can have detrimental effects in marine  
engines, because of increased deposits in  
the combustion chamber. When enough de-  
posits collect, piston rings begin sticking.  
Performance drops and engine wear in-  
creases dramatically.  
While many additives available may reduce  
deposits, Yamaha recommends the use of  
Ring Free Fuel Additive, available from  
your Yamaha dealer. Ring Free Fuel Addi-  
tive has repeatedly proven its ability to clean  
combustion deposits from inside the engine,  
notably the critical piston-ring-land area, and  
fuel system components. Follow product la-  
beling for use instructions.  
1. Engine oil  
2. Gasoline  
2. Replace the fuel tank cap and close  
tightly.  
3. Shake the fuel tank to mix the fuel thor-  
oughly.  
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.  
21  
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Operation  
2. Replace the fuel can cap and close tight-  
are flammable and explosive. Refrain  
from smoking, and keep away from  
open flames and sparks while loosen-  
ing the air vent screw.  
ly.  
3. Shake the fuel can to mix the fuel thor-  
oughly.  
4. Make sure that the oil and gasoline are G This product emits exhaust gases  
mixed.  
which contain carbon monoxide, a col-  
orless, odorless gas which could cause  
brain damage or death when inhaled.  
Symptoms include nausea, dizziness,  
and drowsiness. Keep cockpit and cab-  
in areas well ventilated. Avoid blocking  
exhaust outlets.  
5. Pour the gasoline and oil mixture into the  
built-in fuel tank.  
ECM00810  
CAUTION:  
G Avoid using any oil other than the spec-  
ified type.  
G Use a thoroughly blended fuel-oil mix-  
ture.  
1. If there is an air vent screw on the fuel  
tank cap, loosen it 2 or 3 turns.  
G If the mixture is not thoroughly mixed,  
or if the mixing ratio is incorrect, the  
following problems could occur. Low  
oil ratio: Lack of oil could cause major  
engine trouble, such as piston seizure.  
G High oil ratio: Too much oil could cause  
fouled spark plugs, smoky exhaust,  
and heavy carbon deposits.  
NOTE:  
ZMU02022  
If using a permanently installed tank, pour  
the oil gradually as the gasoline is being add-  
ed to the tank.  
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.  
EMU27450  
Operating engine  
EMU27461  
Feeding 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  
ZMU04113  
22  
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Operation  
N
ZMU03714  
ZMU02024  
3. If a steering friction adjuster is provided  
on your outboard motor, securely attach  
the fuel line to the fuel line clamp.  
NOTE:  
The start-in-gear protection device prevents  
the engine from starting except when in neu-  
tral.  
NOTE:  
During engine operation place the tank hori-  
zontally, otherwise fuel cannot be drawn  
from the fuel tank.  
2. Attach the engine stop switch lanyard to  
a secure place on your clothing, or your  
arm or leg. Then install the lock plate on  
the other end of the lanyard into the en-  
4. Squeeze the primer pump with the outlet  
end up until you feel it become firm.  
gine stop switch.  
EWM00120  
WARNING  
G Attach the engine stop switch lanyard  
to a secure place on your clothing, or  
your arm or leg while operating.  
G Do not attach the lanyard to clothing  
that could tear loose. Do not route the  
lanyard where it could become entan-  
gled, preventing it from functioning.  
G Avoid accidentally pulling the lanyard  
during normal operation. Loss of en-  
gine 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.  
ZMU02025  
EMU27490  
Starting engine  
EMU27505  
Manual start models (tiller control)  
1. Place the gear shift lever in neutral.  
23  
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Operation  
the engine will run poorly or stall.  
5. Pull the manual starter handle slowly un-  
til you feel resistance. Then give a  
strong pull straight out to crank and start  
the engine. Repeat if necessary.  
ZMU03744  
3. Place the throttle grip in the “  
(start) position.  
6. After the engine starts, slowly return the  
manual starter handle to its original po-  
sition before releasing it.  
7. Slowly return the throttle grip to the fully  
closed position.  
ZMU02954  
4. Pull out / turn the choke knob fully. After  
the engine starts, replace / return the  
knob to the home position.  
ZMU02030  
NOTE:  
G When the engine is cold, it needs to be  
warmed up. For further information, see  
page 25.  
ZMU04114  
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  
NOTE:  
G It is not necessary to use the choke when  
starting a warm engine.  
G If the choke knob is left in the “  
(start) position while the engine is running,  
24  
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Operation  
EMU27740  
EWM00180  
amount and try to start the engine again. If  
the engine still fails to start, see page 48.  
Shifting  
EMU27670  
WARNING  
Warming up engine  
EMU27680  
Before shifting, make sure there are no  
swimmers or obstacles in the water near  
you.  
Choke start models  
1. After starting the engine, allow it to idle  
for 3 minutes to warm up. Failure to do  
so will shorten engine life. Gradually re-  
turn the choke knob to its home position  
as the engine warms up.  
2. Check for a steady flow of water from the  
cooling water pilot hole.  
ECM00510  
ECM00220  
CAUTION:  
To change the boat direction or shifting  
position from forward to reverse or vice-  
versa, first close the throttle so that the  
engine idles (or runs at low speeds).  
EMU27763  
CAUTION:  
Forward (tiller handle and remote  
A flow of water from the hole on the ex-  
haust cover shows that the water pump is  
pumping water through the cooling pas-  
sages. If water is not flowing out of the  
hole at all times while the engine is run-  
ning, 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 problem cannot be located and cor-  
rected.  
control models)  
Tiller control models  
1. Place the throttle grip in the fully closed  
position.  
ZMU02030  
2. Move the gear shift lever quickly and  
firmly from neutral to forward.  
ZMU02856  
25  
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Operation  
sition.  
N
F
ZMU03718  
ZMU03719  
Remote control models  
1. Pull up the neutral interlock trigger (if 3. Move the gear shift lever quickly and  
equipped) and move the remote control  
lever quickly and firmly from neutral to  
forward.  
firmly from neutral to reverse.  
R
N
EMU27795  
Reverse (manual tilt and hydro tilt  
models)  
EWM00190  
WARNING  
When operating in reverse, go slowly. Do  
not open the throttle more than half. Oth-  
erwise the boat could become unstable,  
which could result in loss of control and  
an accident.  
ZMU03720  
Remote control models  
1. Check that the tilt lock lever is in the lock  
position.  
Tiller control models  
2. Pull up the neutral interlock trigger (if  
equipped) and move the remote control  
lever quickly and firmly from neutral to  
1. Place the throttle grip in the fully closed  
position.  
reverse.  
EMU27820  
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.  
EMU27832  
ZMU02030  
Procedure  
1. Push and hold the engine stop button  
until the engine comes to a complete  
stop.  
2. On models equipped with a tilt lock le-  
ver, check that it is in the lock/down po-  
26  
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Operation  
ing the lock plate from the engine stop  
switch.  
EMU27861  
Trimming outboard motor  
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  
angle depends upon the combination of  
boat, engine, and propeller. Correct trim is  
also affected by variables such as the load in  
ZMU03690  
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.  
the boat, sea conditions, and running speed.  
EWM00740  
WARNING  
Excessive trim for the operating condi-  
tions (either trim up or trim down) can  
cause boat instability and can make  
steering the boat more difficult. This in-  
creases 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.  
ZMU02301  
3. Disconnect the fuel line if you are using  
an external fuel tank.  
ZMU04121  
NOTE:  
If the outboard motor is equipped with an en-  
gine stop switch lanyard, the engine can also  
be stopped by pulling the lanyard and remov-  
27  
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Operation  
1
ZMU02909  
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  
angles to find the position that works best for  
1
ZMU02858  
your boat and operating conditions.  
EWM00400  
1. Trim operating angle  
WARNING  
EMU27871  
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 instabil-  
ity or control problems. Improper trim  
angle can cause loss of control.  
Adjusting 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. Remove the trim rod from the clamp  
bracket while slightly tilting the outboard  
motor up.  
NOTE:  
The outboard motor trim angle can be  
changed approximately 4 degrees by shifting  
the trim rod one hole.  
EMU27911  
Adjusting 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  
28  
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Operation  
the boat is up about 3 to 5 degrees. With the and making it hard to increase speed. Oper-  
bow up, the boat may have a greater tenden- ating with excessive trim-in at higher speeds  
cy to steer to one side or the other. Compen- also makes the boat unstable. Resistance at  
sate for this as you steer. The trim tab can the bow is greatly increased, heightening the  
also be adjusted to help offset this effect. danger of bow steeringand making opera-  
When the bow of the boat is down, it is easier tion difficult and dangerous.  
to accelerate from a standing start onto  
plane.  
NOTE:  
Depending on the type of boat, the outboard  
Bow Up  
motor trim angle may have little effect on the  
trim of the boat when operating.  
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  
boat is pushing the water and there is more  
air drag. Excessive trim-out can also cause  
the propeller to ventilate, which reduces per-  
formance further, and the boat may por-  
poise(hop in the water), which could throw  
the operator and passengers overboard.  
EMU27931  
Tilting up and down  
If the engine will be stopped for some time or  
if the boat is moored in shallows, the out-  
board motor should be tilted up to protect the  
propeller and casing from damage by colli-  
sion with obstructions, and also to reduce  
salt corrosion.  
EWM00220  
WARNING  
Be sure all people are clear of the out-  
board motor when tilting up and down,  
also be careful not to pinch any body  
parts between the drive unit and engine  
bracket.  
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  
Bow Down  
Too much trim-in causes the boat to plow”  
through the water, decreasing fuel economy  
29  
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Operation  
the engine will be tilted for more than a  
few minutes. Otherwise fuel may leak.  
ECM00241  
CAUTION:  
G Before tilting the outboard motor, stop  
the engine by following the procedure  
on page 26. 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.  
ZMU03726  
4. Hold the rear of the top cowling with one  
hand, tilt the engine up, and turn the tilt  
support lever to the lock position and  
EMU27952  
support the engine.  
Procedure for tilting up  
Manual tilt models  
1. Place the gear shift lever in neutral.  
EMU28022  
Procedure for tilting down (manual  
tilt models)  
1. Place the tilt lock lever in the release/  
down position or return the shallow wa-  
ter lever to its original position.  
N
ZMU03724  
2. Disconnect the fuel line if a fuel joint is  
provided on the outboard motor.  
ZMU03747  
ZMU03725  
ZMU03731  
3. Place the tilt lock lever in the release po-  
sition.  
2. Slightly tilt the engine up until the tilt sup-  
30  
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Operation  
port bar is automatically released.  
3. Slowly tilt the engine down.  
EMU28060  
Cruising in shallow water  
The outboard motor can be tilted up partially  
to allow operation in shallow water.  
EMU28071  
Cruising in shallow water (manual tilt  
models)  
ZMU02868  
EWM00710  
WARNING  
EMU28132  
G Place the gear shift in neutral before us-  
ing the shallow water cruising system.  
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.  
Hitting an underwater obstacle could  
cause the outboard motor to lift out of  
the water, resulting in loss of control.  
G Do not rotate the outboard motor 180°  
and operate the boat in reverse. Place  
the gear shift in reverse to operate the  
boat in reverse.  
Procedure  
1. Place the gear shift lever in neutral.  
N
ZMU03745  
2. Push the tilt lock lever down to release it.  
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 ac-  
cident and personal injury.  
G Return the outboard motor to its normal  
position as soon as the boat is back in  
deeper water.  
ZMU03746  
ECM00260  
CAUTION:  
3. Pull up the shallow water lever.  
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.  
31  
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Operation  
ZMU03728  
ZMU03731  
4. Slightly tilt the outboard motor up. The 6. Slightly tilt the outboard motor up until  
tilt support bar will lock automatically,  
supporting the outboard motor in a par-  
tially raised position.  
the tilt support bar automatically returns  
to the free position.  
7. Slowly lower the outboard motor to the  
normal position.  
NOTE:  
EMU28190  
This outboard motor has 2 positions for shal-  
low water cruising.  
Cruising in other conditions  
Cruising in salt water  
5. To return the outboard motor to the nor-  
mal running position, place the tilt lock  
lever and shallow water lever to the lock  
position.  
After operating in salt water, wash out the  
cooling water passages with fresh water to  
prevent them from becoming clogged with  
salt deposits.  
NOTE:  
For cooling system flushing instructions, see  
page 33.  
Cruising in turbid water  
Yamaha strongly recommends that you use  
the optional chromium-plated water pump kit  
if you use the outboard motor in turbid (mud-  
dy) water conditions.  
ZMU03729  
32  
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Maintenance  
EMU28216  
Choke valve  
Alternator output:  
80 W  
Specifications  
Dimension:  
Overall length:  
Drive unit:  
Gear positions:  
Forward-neutral-reverse  
Gear ratio:  
2.08 (27/13)  
936 mm (36.9 in)  
Overall width:  
358 mm (14.1 in)  
Overall height S:  
1068 mm (42.0 in)  
Transom height S:  
419 mm (16.5 in)  
Weight (AL) S:  
Trim and tilt system:  
Manual tilt  
Propeller mark:  
F
48.0 kg (106 lb)  
Performance:  
Fuel and oil:  
Recommended fuel:  
Full throttle operating range:  
50006000 r/min  
Maximum output:  
18.4 kW@5500 r/min (25 HP@5500  
r/min)  
Regular unleaded gasoline  
Min. pump octane:  
86  
Recommended engine oil:  
YAMALUBE 2-stroke outboard motor  
oil  
Idling speed (in neutral):  
750 50 r/min  
Fuel:oil ratio:  
Engine:  
Regular gasoline:  
Type:  
100 :1  
2-stroke L  
Lubrication:  
Displacement:  
395.0 cm (24.10 cu.in)  
Bore × stroke:  
67.0 × 56.0 mm (2.64 × 2.20 in)  
Ignition system:  
CDI  
Pre-mixed fuel and oil  
Recommended gear oil:  
Hypoid gear oil SAE#90  
Gear oil quantity:  
3
3
370.0 cm (12.51 US oz) (13.05  
Imp.oz)  
Spark plug (NGK):  
B7HS-10  
Tightening torque for engine:  
Spark plug:  
Spark plug with resistor (NGK):  
BR7HS-10  
25.0 Nm (18.4 ft-lb) (2.55 kgf-m)  
Propeller nut:  
Spark plug gap:  
0.91.0 mm (0.0350.039 in)  
Control system:  
Tiller  
Starting system:  
Manual  
35.0 Nm (25.8 ft-lb) (3.57 kgf-m)  
EMU28222  
Transporting and storing  
outboard motor  
EWM00690  
WARNING  
Starting carburetion system:  
G Leaking fuel is a fire hazard. When  
33  
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Maintenance  
transporting and storing the outboard  
motor, close the air vent screw and fuel  
cock to prevent fuel from leaking.  
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 consid-  
erably as it warms up and can build up  
pressure in the fuel container. This can  
cause fuel leakage and a potential fire  
hazard.  
ZMU02870  
EMU28235  
Clamp screw mounting models  
When transporting or storing the outboard  
motor while removed from a boat, keep the  
outboard motor in the attitude shown.  
EWM00700  
WARNING  
Never get under the lower unit while it is  
tilted, even if a motor support bar is used.  
Severe injury could occur if the outboard  
motor accidentally falls.  
ECM00660  
CAUTION:  
Do not use the tilt support lever or knob  
when trailering the boat. The outboard  
motor could shake loose from the tilt sup-  
port and fall. If the motor cannot be trail-  
ered in the normal running position, use  
an additional support device to secure it  
in the tilt position.  
ZMU02869  
NOTE:  
Place a towel or something similar under the  
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 po-  
sition using a motor support device such as  
a transom saver bar. Consult your Yamaha  
dealer for further details.  
outboard motor to protect it from damage.  
EMU30272  
Storing 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  
prior to storage. However, you, the owner,  
with a minimum of tools, can perform the fol-  
34  
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Maintenance  
lowing procedures.  
ECM01411  
CAUTION:  
1
2
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 trou-  
ble.  
ZMU02051  
G Store the outboard motor in a dry, well-  
ventilated place, not in direct sunlight.  
1. Water surface  
EMU28301  
2. Lowest water level  
Procedure  
EMU28372  
5. Fill the tank with fresh water to above the  
level of the anti-cavitation plate.  
ECM00300  
Flushing in a test tank  
1. Wash the outboard motor body using  
fresh water. For further information, see  
page 36.  
2. Fill the fuel tank with fresh fuel and add  
one ounce of Yamaha Fuel Conditioner  
and Stabilizer(Part No. LUB-FUELC-  
12-00) to each gallon of fuel.  
CAUTION:  
Do not run the engine without supplying  
it with cooling water. Either the engine  
water pump will be damaged or the en-  
gine will be damaged from overheating.  
Before starting the engine, be sure to  
supply water to the cooling water passag-  
es.  
NOTE:  
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.  
ECM00290  
CAUTION:  
If the fresh water level is below the level  
of the anti-cavitation plate, or if the water  
3. Remove the engine top cowling and si- supply is insufficient, engine seizure may  
lencer cover.  
occur.  
4. Install the outboard motor on the test  
tank.  
6. Cooling system flushing is essential to  
prevent the cooling system from clog-  
ging up with salt, sand, or dirt. In addi-  
tion, fogging of the engine is mandatory  
to prevent excessive engine damage  
due to rust. Perform the flushing and  
fogging at the same time.  
EWM00090  
WARNING  
G Do not touch or remove electrical parts  
35  
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Maintenance  
when starting or during operation.  
G Keep hands, hair, and clothes away  
from the flywheel and other rotating  
parts while the engine is running.  
2. Spray the outboard motor exterior with  
Yamaha Silicone Protectant(Part No.  
LUB-SILCNE-13-00).  
3. Wax the cowling with a non-abrasive  
wax such as Yamaha Silicone Wax”  
7. Run the engine at a fast idle for 1015  
minutes in neutral position.  
(Part No. ACC-11000-15-02).  
EMU28450  
8. Just prior to turning off the engine, quick-  
ly spray Yamaha Stor-Rite Engine  
Fogging Oil(Part No. LUB-STRRT-12-  
00) alternately 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.  
Cleaning the outboard motor  
After use, wash the exterior of the outboard  
motor with fresh water. Flush the cooling  
system with fresh water.  
9. Remove the outboard motor from the  
test tank.  
10. Drain the cooling water completely out  
of the motor. Clean the body thoroughly.  
11. Install the silencer cover/cap and top  
cowling.  
EMU28400  
Lubrication (except oil injection  
models)  
1. Grease the spark plug threads and in-  
stall the spark plug(s) and torque to  
proper specification. For information on  
spark plug installation, see page 39.  
2. Change the gear oil. For instructions,  
see page 44. Inspect the oil for the pres-  
ence of water that indicates a leaky seal.  
Seal replacement should be performed  
by an authorized Yamaha dealer prior to  
use.  
ZMU02871  
NOTE:  
For cooling system flushing instructions, see  
page 33.  
3. Grease all grease fittings. For further de-  
EMU28460  
tails, see page 39.  
Checking 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 avail-  
able from your Yamaha dealer.  
EMU28421  
Cleaning and anticorrosion  
measures  
1. Wash down the exterior of the outboard  
motor with fresh water and dry off com-  
pletely.  
36  
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Maintenance  
EMU28483  
Periodic maintenance  
EWM01070  
WARNING  
Be sure to turn off the engine when you  
perform maintenance unless otherwise  
specified. If you or the owner is not famil-  
iar with machine servicing, this work  
should be done by your Yamaha dealer or  
other qualified mechanic.  
Maintenance, replacement, or repair of  
the emission control devices and sys-  
tems may be performed by any marine  
engine repair establishment or individual.  
All warranty repairs, however, including  
those to the emission control system,  
must be performed 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.  
EMU28510  
Replacement parts  
If replacement parts are necessary, use only  
genuine Yamaha parts or parts of the same  
type and of equivalent strength and materi-  
als. Any part of inferior quality may malfunc-  
tion, and the resulting loss of control could  
endanger the operator and passengers.  
Yamaha genuine parts and accessories are  
available from your Yamaha dealer.  
37  
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Maintenance  
EMU28521  
Maintenance chart  
Frequency of maintenance operations may be adjusted according to the operating condi-  
tions, but the following table gives general guidelines. Refer to the sections in this chapter for  
explanations of each owner-specific action.  
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  
50 hours  
100  
hours (6  
months)  
200  
hours (1  
year)  
Item  
Actions  
10 hours  
(1 month)  
(3  
months)  
Inspection / replace-  
ment  
Inspection / replace-  
ment  
Anode(s) (external)  
Anode(s) (internal)  
Cooling water pas-  
sages  
Cleaning  
Cowling clamp  
Inspection  
Fuel lter (can be dis-  
assembled)  
Inspection / cleaning  
Inspection  
Fuel system  
Fuel tank (Yamaha por-  
table tank)  
Inspection / cleaning  
Gear oil  
Change  
Greasing points  
Greasing  
Idling speed (carbure-  
tor models)  
Inspection / adjustment  
Inspection / replace-  
ment  
Propeller and cotter pin  
Shift link / shift cable  
Thermostat  
Inspection / adjustment  
Inspection  
Throttle link / throttle  
cable / throttle pick-up  
timing  
Inspection / adjustment  
Water pump  
Inspection  
Cleaning / adjustment /  
replacement  
Spark plug(s)  
NOTE:  
When operating in salt water, turbid or muddy water, the engine should be flushed with clean  
water after each use.  
38  
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Maintenance  
EMU28931  
Greasing  
Yamaha marine grease (Water resistant grease)  
25D  
ZMU03734  
EMU28951  
sparks, which could lead to explosion or  
fire.  
Cleaning and adjusting spark plug  
EWM00560  
The spark plug is an important engine com-  
ponent and is easy to inspect. The condition  
of the spark plug can indicate something  
about the condition of the engine. For exam-  
WARNING  
When removing or installing a spark plug,  
be careful not to damage the insulator. A  
damaged insulator could allow external  
39  
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Maintenance  
ple, if the center electrode porcelain is very spark plug to the correct torque.  
white, this could indicate an intake air leak or  
carburetion problem in that cylinder. Do not  
attempt to diagnose any problems yourself.  
Instead, take the outboard motor to a  
Yamaha dealer. You should periodically re-  
move and inspect the spark plug because  
heat and deposits will cause the spark plug  
to slowly break down and erode. If electrode  
erosion becomes excessive, or if carbon and  
other deposits are excessive, you should re-  
place the spark plug with another of the cor-  
rect type.  
Spark plug torque:  
25.0 Nm (18.4 ft-lb) (2.55 kgf-m)  
NOTE:  
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 fin-  
ger-tight. Have the spark plug adjusted to the  
correct torque as soon as possible with a  
torque-wrench.  
EMU28962  
Checking fuel system  
EWM00060  
Standard spark plug:  
B7HS-10  
WARNING  
BR7HS-10  
Gasoline and its vapors are highly flam-  
mable and explosive. Keep away from  
sparks, cigarettes, flames, or other  
sources of ignition.  
Before fitting the spark plug, measure the  
electrode gap with a wire thickness gauge;  
adjust the gap to specification if necessary.  
EWM00910  
WARNING  
Leaking fuel can result in fire or explo-  
sion.  
G Check for fuel leakage regularly.  
G If any fuel leakage is found, the fuel  
system must be repaired by a qualified  
mechanic. Improper repairs can make  
the outboard unsafe to operate.  
Check the fuel lines for leaks, crack, or mal-  
function. If a problem is found, your Yamaha  
dealer or other qualified mechanic should re-  
pair it immediately.  
1. Spark plug gap  
2. Spark plug I.D. mark (NGK)  
Spark plug gap:  
0.91.0 mm (0.0350.039 in)  
When fitting the plug, always clean the gas-  
ket surface and use a new gasket. Wipe off  
any dirt from the threads and screw in the  
40  
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Maintenance  
EMU29001  
Cleaning fuel filter  
1. Remove the nut holding the fuel filter as-  
sembly if equipped.  
1
ZMU04772  
Checkpoints  
G Fuel system parts leakage  
G Fuel line joint leakage  
ZMU03812  
G Fuel line cracks or other damage  
G Fuel connector leakage  
EMU28980  
1. Nut  
2. Unscrew the filter cup, catching any  
spilled fuel in a rag.  
Inspecting fuel filter  
EWM00310  
WARNING  
3. Remove the filter element, and wash it in  
solvent. Allow it to dry. Inspect the filter  
element and O-ring to make sure they  
are in good condition. Replace them if  
necessary. If any water is found in the  
fuel, the Yamaha portable fuel tank or  
other fuel tanks should be checked and  
cleaned.  
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 Do not perform this procedure on a hot  
or running engine. Allow the engine to  
cool.  
G There will be fuel in the fuel filter. Keep  
away from sparks, cigarettes, flames or  
other sources of ignition.  
G This procedure will allow some fuel to  
spill. Catch fuel in a rag. Wipe up any  
spilled fuel immediately.  
2
3
4
G The fuel filter must be reassembled  
carefully with the O-ring, filter cup, and  
hoses in place. Improper assembly or  
replacement could result in a fuel leak,  
which could result in a fire or explosion  
hazard.  
1
ZMU02079  
1. Filter cup  
2. Filter element  
3. Filter housing  
4. O-ring  
41  
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Maintenance  
4. Reinstall the filter element in the cup.  
Make sure the O-ring is in position in the  
cup. Firmly screw the cup onto the filter  
housing.  
5. Attach the filter assembly to the bracket  
so that the fuel hoses are attached to the  
filter assembly.  
the boat is tightly moored.  
NOTE:  
Correct idling speed inspection is only possi-  
ble if the engine is fully warmed up. If not  
warmed up fully, the idle speed will measure  
higher than normal. If you have difficulty ver-  
ifying the idle speed, or the idle speed re-  
quires adjustment, consult a Yamaha dealer  
or other qualified mechanic.  
6. Run the engine and check the filter and  
lines for leaks.  
EMU29040  
2. Verify whether the idle speed is set to  
specification. For idle speed specifica-  
Inspecting idling speed  
EWM00450  
WARNING  
G Do not touch or remove electrical parts  
when starting or during operation.  
tions, see page 33.  
EMU29111  
Checking wiring and connectors  
G Check that each grounding wire is properly  
secured.  
G Check that each connector is engaged se-  
curely.  
G Keep hands, hair, and clothes away  
from the flywheel and other rotating  
parts while the engine is running.  
G 2-hp models: The propeller rotates  
whenever the engine is running. Do not  
move the throttle control lever from the  
start position during warm-up. The boat  
could unexpectedly start to move,  
which could result in an accident.  
ECM00490  
CAUTION:  
This procedure must be performed while  
the outboard motor is in the water. A  
flushing attachment or test tank can be  
used.  
ZMU03737  
EMU29120  
Exhaust leakage  
Start the engine and check that no exhaust  
leaks from the joints between the exhaust  
cover, cylinder head, and body cylinder.  
EMU29130  
A diagnostic tachometer should be used for  
this procedure. Results may vary depending  
on whether testing is conducted 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 smooth-  
ly.  
Water leakage  
Start the engine and check that no water  
leaks from the joints between the exhaust  
cover, cylinder head, and body cylinder.  
2-hp model: Warm the engine with the  
throttle in the start position or less. If the  
outboard is mounted on a boat, be sure  
42  
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Maintenance  
EMU29171  
Checking propeller  
EWM00321  
WARNING  
You could be seriously injured if the en-  
gine accidentally starts when you are  
near the propeller.  
G Before inspecting, removing, or install-  
ing the propeller, remove the spark  
plug caps from the spark plugs. Also,  
place the shift control in neutral, turn  
ZMU01897  
Checkpoints  
the main switch to “  
(off) and re-  
G Check each of the propeller blades for  
wear, erosion from cavitation or ventila-  
tion, or other damage.  
G Check the propeller shaft for damage.  
G Check the splines / shear pin for wear or  
damage.  
move the key, and remove the lanyard  
from the engine stop switch. Turn off  
the battery cut-off switch if your boat  
has one.  
G Do not use your hand to hold the pro-  
peller when loosening or tightening the  
propeller nut. Put a wood block be-  
tween the anti-cavitation plate and the  
propeller to prevent the propeller from  
turning.  
G Check for fish line tangled around the pro-  
peller shaft.  
G Check the propeller shaft oil seal for dam-  
age.  
ZMU02876  
NOTE:  
If the shear pin equipped: it is designed to  
break if the propeller hits a hard underwater  
obstacle to help protect the propeller and  
drive mechanism. The propeller will then  
spin freely on the shaft. If this happens, the  
shear pin must be replaced.  
43  
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Maintenance  
EMU29193  
washer, and propeller on the propeller  
shaft.  
3. Install the spacer (if equipped) and the  
washer. Tighten the propeller nut to the  
specified torque.  
4. Align the propeller nut with the propeller  
shaft hole. Insert a new cotter pin in the  
hole and bend the cotter pin ends.  
Removing the propeller  
1. Straighten the cotter pin and pull it out  
using a pair of pliers.  
2. Remove the propeller nut, washer, and  
spacer (if equipped).  
1
2
3
4
5
6
ZMU02829  
1. Cotter pin  
2. Propeller nut  
3. Washer  
4. Spacer  
5. Propeller  
6. Thrust washer  
ZMU02063  
NOTE:  
If the propeller nut does not align with the  
propeller shaft hole after tightening to the  
specified torque, tighten the nut further to  
align it with the hole.  
3. Remove the propeller and thrust wash-  
er.  
EMU29280  
EMU29230  
Changing gear oil  
Installing the propeller  
EWM00800  
ECM00340  
WARNING  
CAUTION:  
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  
occur if the outboard motor accidental-  
ly falls.  
G Be sure to install the thrust washer be-  
fore installing the propeller, otherwise  
the lower case and propeller boss  
could be damaged.  
G Be sure to use a new cotter pin and  
bend the ends over securely. Otherwise  
the propeller could come off during op-  
eration and be lost.  
1. Apply Yamaha marine grease or a cor-  
rosion resistant grease to the propeller  
shaft.  
1. Tilt the outboard motor so that the gear  
oil drain screw is at the lowest point pos-  
sible.  
2. Install the spacer(if equipped), thrust  
2. Place a suitable container under the  
44  
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Maintenance  
gear case.  
the gear oil drain screw hole.  
3. Remove the gear oil drain screw.  
Recommended gear oil:  
Hypoid gear oil SAE#90  
Gear oil quantity:  
3
370.0 cm (12.51 US oz) (13.05  
Imp.oz)  
2
1
ZMU03738  
1. Gear oil drain screw  
2. Oil level plug  
NOTE:  
ZMU03739  
If the magnetic gear oil drain screw  
equipped: remove all metal particles from  
the screw before installing it.  
6. When the oil begins to flow out of the oil  
level plug hole, insert and tighten the oil  
level plug.  
4. Remove the oil level plug to allow the oil  
7. Insert and tighten the gear oil drain  
screw.  
EMU29302  
to drain completely.  
ECM00710  
CAUTION:  
Cleaning fuel tank  
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. Consult a Yamaha dealer for re-  
pair of the lower unit seals.  
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.  
NOTE:  
For disposal of used oil consult your Yamaha  
dealer.  
5. With the outboard motor in a vertical po-  
sition, and using a flexible or pressur-  
ized filling device, inject the gear oil into  
G Remove the fuel tank from the boat be-  
fore cleaning it. Work only outdoors in  
an area with good ventilation.  
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-  
45  
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Maintenance  
plosion hazard.  
G Dispose of old gasoline according to lo-  
cal regulations.  
NOTE:  
Inspect ground leads attached to external  
anodes on equipped models. Consult a  
Yamaha dealer for inspection and replace-  
ment of internal anodes attached to the pow-  
er unit.  
1. Empty the fuel tank into an approved  
container.  
2. Pour a small amount of suitable solvent  
into the tank. Install the cap and shake  
the tank. Drain the solvent completely.  
3. Remove the screws holding the fuel joint  
assembly. Pull the assembly out of the  
tank.  
ZMU02924  
EMU29390  
Checking top cowling  
Check the fitting of the top cowling by push-  
ing it with both hands. If it is loose have it re-  
paired by your Yamaha dealer.  
ZMU02066  
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.  
EMU29312  
Inspecting 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  
ZMU04677  
EMU29400  
Coating the boat bottom  
A clean hull improves boat performance. The  
boat bottom should be kept as clean of ma-  
rine growth as possible. If necessary, the  
boat bottom can be coated with an anti-foul-  
ing paint approved for your area to inhibit  
marine growth.  
anodes.  
ECM00720  
CAUTION:  
Do not paint anodes, as this would render  
them ineffective.  
Do not use anti-fouling paint which includes  
46  
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Maintenance  
copper or graphite. These paints can cause  
more rapid engine corrosion.  
ZMU01943  
47  
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Trouble Recovery  
EMU29422  
A. Fill tank with clean, fresh fuel.  
Troubleshooting  
A problem in the fuel, compression, or igni-  
tion systems can cause poor starting, loss of  
power, or other problems. This section de-  
scribes basic checks and possible remedies,  
and covers all Yamaha outboard motors.  
Therefore some items may not apply to your  
model.  
Q. Is fuel filter clogged?  
A. Clean or replace filter.  
Q. Is starting procedure incorrect?  
A. See page 23.  
Q. Has fuel pump malfunctioned?  
If your outboard motor requires repair, bring  
it to your Yamaha dealer.  
A. Have serviced by a Yamaha dealer.  
If the engine trouble warning indicator is  
flashing, consult your Yamaha dealer.  
Q. Are spark plug(s) fouled or of incorrect  
type?  
A. Inspect spark plug(s). Clean or replace  
with recommended type.  
Starter will not operate.  
Q. Is battery capacity weak or low?  
A. Check battery condition. Use battery of  
recommended capacity.  
Q. Are spark plug cap(s) fitted incorrectly?  
A. Check and re-fit cap(s).  
Q. Are battery connections loose or corrod-  
ed?  
Q. Is ignition wiring damaged or poorly con-  
nected?  
A. Tighten battery cables and clean battery  
terminals.  
A. Check wires for wear or breaks. Tighten  
all loose connections. Replace worn or bro-  
ken wires.  
Q. Is fuse for electric start relay or electric cir-  
cuit blown?  
Q. Are ignition parts faulty?  
A. Check for cause of electric overload and  
repair. Replace fuse with one of correct am-  
perage.  
A. Have serviced by a Yamaha dealer.  
Q. Is engine stop switch lanyard not at-  
tached?  
Q. Are starter components faulty?  
A. Attach lanyard.  
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?  
Engine will not start (starter operates).  
Q. Is fuel tank empty?  
A. Fill tank with clean, fresh fuel.  
A. Inspect spark plug(s). Clean or replace  
with recommended type.  
Q. Is fuel contaminated or stale?  
48  
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Trouble Recovery  
Q. Is fuel system obstructed?  
A. Return to home position.  
A. Check for pinched or kinked fuel line or  
other obstructions in fuel system.  
Q. Is motor angle too high?  
A. Return to normal operating position.  
Q. Is fuel contaminated or stale?  
A. Fill tank with clean, fresh fuel.  
Q. Is carburetor clogged?  
A. Have serviced by a Yamaha dealer.  
Q. Is fuel filter clogged?  
A. Clean or replace filter.  
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 warning system activated?  
A. Find and correct cause of warning.  
Q. Is battery cable disconnected?  
A. Connect securely.  
Q. Is spark plug gap incorrect?  
A. Inspect and adjust as specified.  
Warning 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 bro- Q. Is engine oil level low?  
ken 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 deteriorat-  
ed?  
Q. Is fuel pump damaged?  
A. Replace oil with fresh, specified type.  
A. Have serviced by a Yamaha dealer.  
Q. Is oil filter clogged?  
Q. Is air vent screw on fuel tank closed?  
A. Open air vent screw.  
A. Have serviced by a Yamaha dealer.  
Q. Has oil feed/injection pump malfunc-  
tioned?  
Q. Is choke knob pulled out?  
49  
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Trouble Recovery  
A. Have serviced by a Yamaha dealer.  
Q. Is load on boat improperly distributed?  
Q. Are weeds or other foreign matter tangled  
on gear housing?  
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  
other 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 out-  
A. Inspect and adjust as specified.  
board at its recommended speed (r/min) Q. Is ignition wiring damaged or poorly con-  
range.  
nected?  
A. Check wires for wear or breaks. Tighten  
all loose connections. Replace worn or bro-  
Q. Is trim angle incorrect?  
A. Adjust trim angle to achieve most efficient ken wires.  
operation.  
Q. Have ignition parts failed?  
Q. Is motor mounted at incorrect height on A. Have serviced by a Yamaha dealer.  
transom?  
A. Have motor adjusted to proper transom Q. Is specified engine oil not being used?  
height.  
A. Check and replace oil with specified type.  
Q. Has warning system activated?  
A. Find and correct cause of warning.  
Q. Is thermostat faulty or clogged?  
A. Have serviced by a Yamaha dealer.  
Q. Is boat bottom fouled with marine growth? Q. Is air vent screw closed?  
A. Clean boat bottom. A. Open the air vent screw.  
Q. Are spark plug(s) fouled or of incorrect Q. Is fuel pump damaged?  
type?  
A. Have serviced by a Yamaha dealer.  
A. Inspect spark plug(s). Clean or replace  
with recommended type.  
Q. Is fuel joint connection incorrect?  
A. Connect correctly.  
50  
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Trouble Recovery  
board motor unsafe to operate.  
Q. Is heat range of spark plug incorrect?  
A. Inspect spark plug and replace it with rec-  
ommended type.  
If the outboard motor hits an object in the wa-  
ter, follow the procedure below.  
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.  
Engine vibrates excessively.  
Q. Is propeller damaged?  
A. Have propeller repaired or replaced.  
1. Stop the engine immediately.  
2. Inspect the control system and all com-  
ponents for damage. Also inspect the  
boat for damage.  
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.  
Q. Are weeds or other foreign matter tangled  
on propeller?  
A. Remove and clean propeller.  
4. Have a Yamaha dealer inspect the out-  
board motor before operating it again.  
EMU29531  
Starter will not operate  
Q. Is motor mounting bolt loose?  
A. Tighten bolt.  
If the starter mechanism does not operate  
(the engine cannot be cranked with the start-  
er), the engine can be started with an emer-  
gency starter rope.  
EWM01020  
Q. Is steering pivot loose or damaged?  
A. Tighten or have serviced by a Yamaha  
dealer.  
WARNING  
G Use this procedure only in an emergen-  
cy and only to return to port for repairs.  
G When the emergency starter rope is  
used to start the engine, the start-in-  
gear protection device does not oper-  
ate. Make sure the remote control lever  
is in neutral. Otherwise the boat could  
unexpectedly start to move, which  
could result in an accident.  
EMU29431  
Temporary action in  
emergency  
EMU29440  
Impact damage  
EWM00870  
WARNING  
The outboard motor can be seriously  
damaged by a collision while operating or  
trailering. Damage could make the out-  
G Attach the engine stop switch lanyard  
to a secure place on your clothing, or  
51  
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Trouble Recovery  
your arm or leg while operating.  
G Do not attach the lanyard to clothing  
that could tear loose. Do not route the  
cord where it could become entangled,  
preventing it from functioning.  
1
G Avoid accidentally pulling the lanyard  
during normal operation. Loss of en-  
gine 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.  
ZMU03740  
1. Start-in-gear protection cable  
G Be sure no one is standing behind you  
when pulling the starter rope. It could  
whip behind you and injure someone.  
G An unguarded, rotating flywheel is very  
dangerous. Keep loose clothing and  
other objects away when starting the  
engine. 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.  
3. Remove the starter/flywheel cover after  
removing the bolt(s).  
ZMU03741  
G Do not touch the ignition coil, spark  
plug wire, spark plug cap, or other elec-  
trical components when starting or op-  
erating the motor. You could get an  
electrical shock.  
4. Prepare the engine for starting. For fur-  
ther information, see page 23. Be sure  
the engine is in neutral and that the en-  
gine stop switch lanyard lock plate is at-  
tached to the engine stop switch. The  
main switch must be “ ” (on), if  
equipped.  
EMU29561  
Emergency starting engine  
1. Remove the top cowling.  
2. Remove the start-in-gear protection ca-  
ble from the starter, if equipped.  
ZMU03742  
52  
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Trouble Recovery  
OFF ON START  
ZMU02928  
ZMU01906  
EMU29760  
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.  
Treatment of submerged motor  
If the outboard motor is submerged, immedi-  
ately take it to a Yamaha dealer. Otherwise  
some corrosion may begin almost immedi-  
ately.  
If you cannot immediately take the outboard  
motor to a Yamaha dealer, follow the proce-  
dure below in order to minimize engine dam-  
age.  
EMU29771  
Procedure  
1. Thoroughly wash away mud, salt, sea-  
weed, and so on, with fresh water.  
ZMU04119  
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.  
ZMU01909  
2. Remove the spark plugs and face the  
spark plug holes downward to allow any  
water, mud, or contaminants to drain.  
53  
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Trouble Recovery  
ZMU01910  
3. Drain the fuel from the carburetor, fuel  
filter, and fuel line.  
4. Feed fogging oil or engine oil through  
the carburetor(s) and spark plug holes  
while cranking with the manual starter or  
emergency starter rope.  
ZMU01911  
5. Take the outboard motor to a Yamaha  
dealer as soon as possible.  
ECM00400  
CAUTION:  
Do not attempt to run the outboard motor  
until it has been completely inspected.  
54  
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Consumer information  
EMU29811  
Important warranty information for U.S.A. and Canada  
55  
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Consumer information  
56  
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Consumer information  
EMU29820  
YAMAHA MOTOR CORPORATION, U.S.A.  
OUTBOARD MOTOR TWO YEAR LIMITED WARRANTY  
57  
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Consumer information  
58  
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Consumer information  
59  
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Consumer information  
EMU29840  
IMPORTANT WARRANTY INFORMATION IF YOU USE YOUR  
YAMAHA OUTSIDE U.S.A. OR CANADA  
60  
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Printed in Japan  
March 2004–0.2 × 1 !  
Printed on recycled paper  
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OUTBOARD MOTOR WARRANTY REGISTRATION  
ENREGISTREMENT DE LA GARANTIE DU MOTEUR HORS-BORD  
Please complete and mail this card. This information is necessary to accurately register your unit for warranty.  
Veuillez signer ci-dessous pour attester que le montage et l’inspection ont été faits dans le respect des directives d’inspection et  
que la marche à suivre pour la garantie et l’entretien a été expliquée à l’acheteur au détail.  
(For Dealer Use Only)  
OUTBOARD MOTOR MODEL AND SERIAL NUMBER (From I.D. label on clamp bracket)  
(A l’usage du concessionnaire)  
MODÉLE ET NO. DE SÉRIE DU MOTEUR HORS-BORD (sur l’étiquette d’identification de la presse de fixation)  
YAMAHA DEALER NUMBER  
NO. DU CONCESSIONNAIRE  
YAMAHA  
DEALER NAME  
NOM DU  
CONCESSIONNAIRE  
YAMAHA MOTOR CO., LTD.  
MADE IN JAPAN  
PAYS D'ORIGINE JAPON  
USAGE  
(Check One)  
PLEASURE  
LOISIR  
DATE SOLD  
DATE DE  
LIVRAISON  
COMMERCIAL  
COMMERCIAL  
UTILISATION  
(En cocher un.)  
MONTH  
DAY  
YEAR  
MOIS  
JOUR  
ANNÉE  
OWNER’S NAME  
NOM DU  
PROPRIÉTAIRE  
FIRST  
PRÉNOM  
LAST  
NOM DE FAMILLE  
ADDRESS  
ADRESSE  
STREET  
RUE  
CITY  
VILLE  
STATE/PROVINCE  
PROVINCE  
ZIP  
CODE POSTAL  
PHONE NUMBER (  
)
NUMÉRO DE TÉLÉPHONE  
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PLACE  
POSTAGE  
HERE  
ATTN: WARRANTY DEPARTMENT  
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