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 steering” and 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:
5000–6000 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:
0.9–1.0 mm (0.035–0.039 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
Stabilizer” eliminates 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 10–15
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 owner’s 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 filter (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:
0.9–1.0 mm (0.035–0.039 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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