Yamaha F 25 Manual

							Trouble Recovery
46
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 wear or breaks. Tighten all
loose connections. Replace worn or broken
wires.
Q. Is specified engine oil not being used?
A. Check and replace oil as specified.
Q. Is thermostat faulty or clogged?
A. Have serviced by a Yamaha dealer.
Q. Are carburetor adjustments incorrect?
A. Have serviced by a Yamaha dealer.
Q. Is fuel pump damaged?
A. Have serviced by a Yamaha dealer.
Q. Is air vent screw on fuel tank closed?
A. Open air vent screw.
Q. Is choke knob pulled out?A. Return to home position.
Q. Is motor angle too high?
A. Return to normal operating position.
Q. Is carburetor clogged?
A. Have serviced by a Yamaha dealer.
Q. Is fuel joint connection incorrect?
A. Connect correctly.
Q. Is throttle valve adjustment incorrect?
A. Have serviced by a Yamaha dealer.
Q. Is battery cable disconnected?
A. Connect securely.
Warning buzzer sounds or indicator lights.
Q. Is cooling system clogged?
A. Check water intake for restriction.
Q. Is engine oil level low?
A. Fill oil tank with specified engine oil.
Q. Is heat range of spark plug incorrect?
A. Inspect spark plug and replace it with rec-
ommended type.
Q. Is specified engine oil not being used?
A. Check and replace oil with specified type.
Q. Is engine oil contaminated or deteriorated?
A. Replace oil with fresh, specified type.
Q. Is oil filter clogged?
A. Have serviced by a Yamaha dealer.
Q. Has oil feed/injection pump malfunc-
tioned?
A. Have serviced by a Yamaha dealer.
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							Trouble Recovery
47
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. Adjust trim angle to achieve most efficient
operation.
Q. Is motor mounted at incorrect height on
transom?
A. Have motor adjusted to proper transom
height.
Q. Has warning system activated?
A. Find and correct cause of warning.
Q. Is boat bottom fouled with marine growth?
A. Clean boat bottom.
Q. Are spark plug(s) fouled or of incorrect
type?
A. Inspect spark plug(s). Clean or replace with
recommended type.
Q. Are weeds or other foreign matter tangled
on gear housing?A. Remove foreign matter and clean lower
unit.
Q. Is fuel system obstructed?
A. Check for pinched or kinked fuel line or oth-
er obstructions in fuel system.
Q. Is fuel filter clogged?
A. Clean or replace filter.
Q. Is fuel contaminated or stale?
A. Fill tank with clean, fresh fuel.
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 wear or breaks. Tighten all
loose connections. Replace worn or broken
wires.
Q. Have electrical parts failed?
A. Have serviced by a Yamaha dealer.
Q. Is specified fuel not being used?
A. Replace fuel with specified type.
Q. Is specified engine oil not being used?
A. Check and replace oil with specified type.
Q. Is thermostat faulty or clogged?
A. Have serviced by a Yamaha dealer.
Q. Is air vent screw closed?
A. Open the air vent screw.
Q. Is fuel pump damaged?
A. Have serviced by a Yamaha dealer.
Q. Is fuel joint connection incorrect?
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							Trouble Recovery
48
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 or other foreign matter tangled
on propeller?
A. Remove and clean propeller.
Q. Is motor mounting bolt loose?
A. Tighten bolt.
Q. Is steering pivot loose or damaged?
A. Tighten or have serviced by a Yamaha
dealer.
EMU29432
Temporary action in emergencyEMU29440Impact damage
WARNING
EWM00870
The outboard motor can be seriously dam-
aged by a collision while operating or
trailering. Damage could make the out-
board motor unsafe to operate.
If the outboard motor hits an object in the wa-
ter, follow the procedure below.
1. Stop the engine immediately.
2. Inspect the control system and all compo-
nents for damage. Also inspect the boat
for damage.
3. Whether damage is found or not, return
to the nearest harbor slowly and careful-
ly.
4. Have a Yamaha dealer inspect the out-
board motor before operating it again.
EMU31300Starter will not operate
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.
WARNING
EWM01450

Use this procedure only in an emergen-
cy to return to the nearest port for re-
pairs.

Make sure the remote control lever is in
neutral. Otherwise the boat could unex-
pectedly start to move, which could re-
sult in an accident.

Attach the engine stop switch lanyard to
a secure place on your clothing, or your
arm or leg while operating the boat.
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							Trouble Recovery
49

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.

Avoid accidentally pulling the lanyard
during normal operation. Loss of engine
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.

Make sure no one is standing behind
you when pulling the starter rope. It
could whip behind you and injure some-
one.

An unguarded, rotating flywheel is very
dangerous. Keep loose clothing and
other objects away when starting the en-
gine. 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.

Do not touch the ignition coil, spark plug
wire, spark plug cap, or other electrical
components when starting or operating
the motor. You could get an electrical
shock.
EMU29631Emergency Starting Engine
1. Remove the top cowling.
2. Remove the bolts from the fuel tank.3. Remove the bolts from the starter case.
4. While lifting the fuel tank up, remove the
bolt from the starter case.
5. Remove the collar.
6. While lifting the starter case up, discon-
nect the choke wire from the carburetor.
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							Trouble Recovery
50
7. Remove the starter case by pulling it to-
wards you.
8. Install the fuel tank bracket by installing
the bolts.
9. Install 2 bolts into the rear section of the
fuel tank.10. Prepare the engine for starting; see page
21. Be sure the engine is in neutral and
that the engine stop switch lanyard lock
plate is attached to the engine stop
switch.
11. Turn the lever on the carburetor to oper-
ate the choke system when the engine is
cold. After the engine starts, return the le-
ver to the original position.
12. While lifting the fuel tank, insert the knot-
ted end of the emergency starter rope
into the notch in the flywheel rotor and
wind the rope several turns clockwise.
NOTE:
If the rope is too long after winding it around
the flywheel, shorten its length at the handle.
13. Pull the rope slowly until resistance is felt.
14. Give a strong pull straight out to crank
and start the engine. Repeat if neces-
sary.
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							Trouble Recovery
51
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 immediate-
ly.
If you cannot immediately take the outboard
motor to a Yamaha dealer, follow the proce-
dure below in order to minimize engine dam-
age.
EMU29783Procedure
1. Thoroughly wash away mud, salt, sea-
weed, and so on, with fresh water.
2. Remove the spark plug(s), then face the
spark plug holes downward to allow any
water, mud, or contaminants to drain.
3. Drain the fuel from the carburetor, fuel fil-
ter, and fuel line. Drain the engine oil
completely.4. Fill the sump with the fresh engine oil.
5. Feed engine fogging oil or engine oil
through the carburetor(s) and spark plug
holes while cranking the engine with the
manual starter or emergency starter
rope.
6. Take the outboard motor to a Yamaha
dealer as soon as possible.
CAUTION:
ECM00400
Do not attempt to run the outboard motor
until it has been completely inspected.
Engine oil capacity:
0.35 L (0.37 US qt) (0.31 Imp.qt)
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							Consumer information
52
EMU29811
Important warranty information for U.S.A. and Canada
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							Consumer information
53
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							Consumer information
54
EMU29830
YAMAHA MOTOR CORPORATION, U.S.A.
 FOUR-STROKE OUTBOARD MOTOR
 THREE-YEAR LIMITED WARRANTY
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							Consumer information
55
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