Yamaha F250 Owners Manual

Maintenance
65
EMU29320Checking battery (for electric start 
models)
WARNING
EWM00330
Battery electrolytic fluid is dangerous; it
contains sulfuric acid and therefore is poi-
sonous and highly caustic.
Always follow these preventive measures:

Avoid bodily contact with electrolytic
fluid as it can cause severe burns or per-
manent eye injury.

Wear protective eye gear when handling
or working near batteries.
Antidote (EXTERNAL):

SKIN - Flush with water.

EYES - Flush with water for 15 minutes
and get...

Maintenance
66
2. Always keep the battery in a good state of
charge. Installing a voltmeter will help
you monitor your battery. If you will not
use the boat for a month or more, remove
the battery from the boat and store it in a
cool, dark place. Completely recharge
the battery before using it.
3. If the battery will be stored for longer than
a month, check the specific gravity of the
fluid at least once a month and recharge
the battery when it is low.
NOTE:
Consult a Yamaha dealer when charging or...

Maintenance
67
NOTE:
If connecting an accessory battery, consult
your Yamaha dealer about correct wiring.
EMU29370Disconnecting the battery
Disconnect the BLACK cable from the NEGA-
TIVE (-) terminal first. Then disconnect the
RED cable from the POSITIVE (+) terminal.
EMU31351Checking top cowling
Check the fitting of the top cowling by pushing
it with both hands. If the top cowling is loose,
reinstall the cowling. If the top cowling is still
loose after reinstalling it, have it repaired by
your Yamaha...

Trouble Recovery
68
EMU29424
Troubleshooting
A problem in the fuel, compression, or ignition
systems can cause poor starting, loss of pow-
er, or other problems. This section describes
basic checks and possible remedies, and cov-
ers all Yamaha outboard motors. Therefore
some items may not apply to your model.
If your outboard motor requires repair, bring it
to your Yamaha dealer.
If the engine trouble warning indicator is flash-
ing, consult your Yamaha dealer.
Starter will not operate.
Q. Is battery...

Trouble Recovery
69
A. Check for pinched or kinked fuel line or oth-
er 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 con-
nected?
A. Check wires for...

Trouble Recovery
70
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 outboard
at its recommended speed (r/min) range.
Q. Is trim angle incorrect?
A....

Trouble Recovery
71
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. Have serviced by a Yamaha dealer.
Q. Are weeds...

Trouble Recovery
72
EMU29471Replacing fuse
If a fuse has blown, remove the electrical cov-
er, open the fuse holder and remove the fuse
with a fuse puller (if equipped). Replace it with
a spare 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.
1. Electrical cover
2. Fuse...

Trouble Recovery
73
EMU29522Power 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.
EMU31591Water...

Trouble Recovery
74
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 hous-
ing.
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 soaking
it up with a rag.
NOTE:
Properly dispose of the rag.
7. Firmly screw the filter cup onto the filter
housing.
NOTE:...