Yamaha F115 Owners Manual

 
75 
Trouble Recovery 
EMU29424 
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.
If your outboard motor requires repair, bring
it to your Yamaha dealer.
If the engine trouble warning indicator is
flashing, consult your Yamaha dealer. 
Starter will not operate. 
Q. Is...

 
Trouble Recovery 
76 
Q. Is fuel system obstructed?
A. Check for pinched or kinked fuel line or
other obstructions in fuel system.
Q. Is fuel contaminated or stale?
A. Fill tank with clean, fresh fuel.
Q. Is fuel filter clogged?
A. Clean or replace filter.
Q. Have ignition parts failed?
A. Have serviced by a Yamaha dealer.
Q. Has warning system activated?
A. Find and correct cause of warning.
Q. Is spark plug gap incorrect?
A. Inspect and adjust as specified.
Q. Is ignition wiring damaged or poorly...

 
Trouble Recovery 
77 
A. Have serviced by a Yamaha dealer.
Q. Is load on boat improperly distributed?
A. Distribute load to place boat on an even
plane.
Q. Is water pump or thermostat faulty?
A. Have serviced by a Yamaha dealer.
Q. Is there excess water in fuel filter cup?
A. Drain filter cup. 
Engine power loss. 
Q. Is propeller damaged?
A. Have propeller repaired or replaced.
Q. Is propeller pitch or diameter incorrect?
A. Install correct propeller to operate out-
board at its recommended speed...

 
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78 
Q. Is fuel joint connection incorrect?
A. Connect correctly.
Q. Is heat range of spark plug incorrect?
A. Inspect spark plug and replace it with rec-
ommended type.
Q. Is high pressure fuel pump drive belt bro-
ken?
A. Have serviced by a Yamaha dealer.
Q. Is engine not responding properly to shift
lever position?
A. Have serviced by a Yamaha dealer. 
Engine vibrates excessively. 
Q. Is propeller damaged?
A. Have propeller repaired or replaced.
Q. Is propeller shaft damaged?
A....

 
Trouble Recovery 
79 
EMU29480 
Replacing fuse 
If the fuse has blown on an electric start
model, remove the electrical cover, open the
fuse holder, and replace the fuse with a new
one of the proper amperage.
WARNING
 
EWM00630  
Be sure to use the specified fuse. An in-
correct fuse or a piece of wire could allow
excessive current flow. This could cause 
electric system damage and a fire hazard.
NOTE:
 
Consult your Yamaha dealer if the new fuse 
immediately blows again. 
EMU29522 
Power trim and tilt...

 
Trouble Recovery 
80 
the power trim and tilt / the power tilt because
of a discharged battery or a failure with the
power trim and tilt unit / the power tilt unit, the
engine can be tilted manually.
1. Loosen the manual valve screw by turn-
ing it counterclockwise until it stops.
2. Put the engine in the desired position,
then tighten the manual valve screw by
turning it clockwise. 
EMU31780 
Water separator warning indicator 
blinks while cruising
WARNING
 
EWM01500  
Gasoline is highly flammable,...

 
Trouble Recovery 
81
NOTE:
 
Be careful not to twist the water detection 
switch lead when unscrewing the filter cup.
5. Drain the water in the filter cup by soak-
ing it up with a rag.
NOTE:
 
Properly dispose of the rag.
6. Firmly screw the filter cup onto the filter
housing.
NOTE:
 
Be careful not to twist the water detection
switch lead when screwing the filter cup onto 
the filter housing.
7. Connect the water detection switch cou-
pler securely until a click is heard.8. Install the top cowling....

 
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82 
power, the boat could slow rapidly. This
could cause people and objects in the
boat to be thrown forward. 
 
Make sure no one is standing behind
you when pulling the starter rope. It
could whip behind you and injure
someone. 
 
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...

 
Trouble Recovery 
83 
8. Rewind the rope around the flywheel ap-
proximately 3/4 of a turn clockwise.
9. Give a strong pull straight out to crank
and start the engine. Repeat if neces-
sary. 
EMU29760 
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....

 
84 
Consumer information 
EMU29811 
Important warranty information for U.S.A. and Canada