Yamaha 8 Cm Owners Manual

							 
Trouble Recovery 
46 
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 con-
nected?
A. Check wires for wear or breaks. Tighten
all loose connections. Replace worn or bro-
ken 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 deteriorat-
ed?
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? 
						

							 
Trouble Recovery 
47 
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 (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
other 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 bro-
ken 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. 
						

							 
Trouble Recovery 
48 
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. 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 
emergency 
EMU29440 
Impact damage
WARNING
 
EWM00870  
The outboard motor can be seriouslydamaged 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 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.
4. Have a Yamaha dealer inspect the out-
board motor before operating it again. 
EMU29532 
Starter 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
 
EWM01021  
 
Use this procedure only in an emergen-
cy to return to the nearest port for re-
pairs. 
 
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 
						

							 
Trouble Recovery 
49 
could result 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. 
 
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 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. 
 
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 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. 
EMU29561 
Emergency starting engine 
1. Remove the top cowling.
2. Remove the start-in-gear protection ca-
ble from the starter, if equipped.
3. Remove the starter/flywheel cover after
removing the bolt(s).4. Prepare the engine for starting. For fur-
ther information, see page 21. 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.
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
ZMU02883
ZMU02884 
						

							 
Trouble Recovery 
50 
up.
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. 
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. 
EMU29771 
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 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.
ZMU02860
ZMU02885
ZMU01909
ZMU01910
ZMU01911 
						

							 
Trouble Recovery 
51 
5. 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. 
						

							 
52 
Consumer information 
EMU29811 
Important warranty information for U.S.A. and Canada 
						

							 
Consumer information 
53 
						

							 
Consumer information 
54 
EMU29820 
YAMAHA MOTOR CORPORATION, U.S.A.
 OUTBOARD MOTOR TWO YEAR LIMITED WARRANTY 
						

							 
Consumer information 
55