Yamaha F50 Manual

 
Trouble Recovery 
75 
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...

 
Trouble Recovery 
76 
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 
77 
EMU29522 
Power trim and tilt / power tilt will not 
operate 
If the engine cannot be tilted up or down with
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. 
EMU31601...

 
Trouble Recovery 
78 
1. Stop the engine.
2. Remove the top cowling.
3. Remove the plastic tie.
4. Disconnect the water detection switch
coupler.
CAUTION:
 
ECM01570  
Be careful not to get any water on the wa-
ter detection switch coupler, otherwise a 
malfunction could occur. 
5. Unscrew the filter cup from the filter
housing.
NOTE:
 
Be careful not to twist the water detection 
switch lead when unscrewing the filter cup.
6. Drain the water in the filter cup by soak-
ing it up with a rag.
NOTE:...

 
Trouble Recovery 
79 
the filter housing.
8. Connect the water detection switch cou-
pler securely until a click is heard.
9. Fasten the water detection switch lead
with the plastic tie.
10. Install the top cowling.
11. Start the engine and make sure that the
water separator warning indicator re-
mains off.
NOTE:
 
Have a Yamaha dealer inspect the outboard 
motor after returning to port. 
EMU29541 
Starter will not operate 
If the starter mechanism does not operate
(the engine cannot be cranked with...

 
Trouble Recovery 
80 
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. 
 
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. 
EMU29581 
Emergency starting engine 
1. Remove the top cowling.
2. Remove the flywheel cover.
3. Prepare the engine for...

 
Trouble Recovery 
81 
EMU29790 
Procedure 
1. Thoroughly wash away mud, salt, sea-
weed, and so on, with fresh water.
2. Remove the spark plugs and face the
spark plug holes downward to allow any
water, mud, or contaminants to drain.
3. Drain the fuel from the vapor separator,
fuel filter, and fuel line.
4. Feed fogging oil or engine oil through
the intake manifold and spark plug holes
while cranking with the emergency start-
er rope.
5. Take the outboard motor to a Yamaha
dealer as soon as possible....

 
82 
Consumer information 
EMU29811 
Important warranty information for U.S.A. and Canada 

 
Consumer information 
83 

 
Consumer information 
84 
EMU29830 
YAMAHA MOTOR CORPORATION, U.S.A.
 FOUR-STROKE OUTBOARD MOTOR
 THREE-YEAR LIMITED WARRANTY