2008 Yamaha Motorsports Apex M-TX Owners Manual - Page 81

2008 Yamaha Motorsports Apex M-TX Manual

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Troubleshooting ESU12381 3. Engine turns over but does not start 1. Fuel system No fuel supplied to combustion chamber • No fuel in tank: Supply fuel. • Clogged fuel line: Clean fuel line. • Clogged injector: Ask a Yamaha dealer to inspect. Fuel supplied to combustion chamber • Flooded engine: Crank engine or wipe the spark plugs dry. 2. Electrical system Poor spark or no spark • Spark plugs are dirty with carbon or are wet: Remove carbon or wipe the spark plugs dry. Replace if necessary. • Faulty ignition system: Ask a Yamaha dealer to inspect. • T.O.R.S. malfunction: Disconnect the throttle switch connectors and connect the wire harness connectors together to bypass the T.O.R.S. Compression Insufficient • Loose cylinder head nuts: Tighten nuts properly. • Worn or damaged gasket: Replace gasket. • Worn or damaged piston and cylinder: Ask a Yamaha dealer to inspect. Discharged battery If the battery is discharged, the engine can be started using a fully-charged 12-volt battery and jumper cables. Two connecting leads have been provided for jump-starting the snowmobile. Due to the rubber engine mounting, the snowmobile frame is not a suitable grounding point for jump-starting the engine. EWS00570 EWS00560 • Connect the jumper cables only to the connecting lead terminals. Do not connect them to the frame or any wire or other lead. • When connecting the jumper cables, do not contact the jumper cables or connecting lead terminals to each other or to the frame or any metal part of the snowmobile. This can cause electrical system damage or A FIRE HAZARD. • Be sure to pull the lead covers back over the terminals completely. If the terminals are exposed, they could come into contact with the frame or a metal part of the snowmobile and this can cause electrical system damage or A FIRE HAZARD. ECS00650 • Before bypassing the T.O.R.S., make sure that the throttle returns properly to the fully closed position. • The T.O.R.S. is an important safety device; in the case of a malfunction, take the snowmobile to a Yamaha dealer immediately for repair. CAUTION: Use the connecting leads to jump-start the snowmobile only. Do not use the connecting leads for any other purpose. 75

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Troubleshooting
ESU12381
Engine turns over but does not start
1.
Fuel system
No fuel supplied to combustion chamber
•
No fuel in tank: Supply
fuel.
•
Clogged fuel line: Clean fuel line.
•
Clogged injector: Ask a Yamaha dealer to
inspect.
Fuel supplied to combustion chamber
•
Flooded engine: Crank engine or wipe
the spark plugs dry.
2.
Electrical system
Poor spark or no spark
•
Spark plugs are dirty with carbon or are
wet: Remove carbon or wipe the spark
plugs dry. Replace if necessary.
•
Faulty ignition system: Ask a Yamaha
dealer to inspect.
•
T.O.R.S. malfunction: Disconnect the
throttle switch connectors and connect
the wire harness connectors together to
bypass the T.O.R.S.
EWS00560
•
Before bypassing the T.O.R.S., make
sure that the throttle returns properly to
the fully closed position.
•
The T.O.R.S. is an important safety de-
vice;
in the case of a malfunction, take
the snowmobile to a Yamaha dealer im-
mediately for repair.
3.
Compression
Insufficient
•
Loose cylinder head nuts: Tighten nuts
properly.
•
Worn or damaged gasket: Replace gas-
ket.
•
Worn or damaged piston and cylinder:
Ask a Yamaha dealer to inspect.
Discharged battery
If the battery is discharged, the engine can be
started using a fully-charged 12-volt battery
and jumper cables. Two connecting leads
have been provided for jump-starting the
snowmobile. Due to the rubber engine mount-
ing,
the snowmobile frame is not a suitable
grounding point for jump-starting the engine.
EWS00570
•
Connect the jumper cables only to the
connecting lead terminals. Do not
con-
nect them to the frame or any wire or
other lead.
•
When connecting the jumper cables, do
not contact the jumper cables or
con-
necting lead terminals to each other or
to the frame or any metal part of the
snowmobile. This can cause electrical
system damage or A FIRE HAZARD.
•
Be sure to pull the lead covers back over
the terminals completely. If the termi-
nals are exposed, they could come into
contact with the frame or a metal part of
the snowmobile and this can cause elec-
trical system damage or A FIRE HAZ-
ARD.
ECS00650
CAUTION:
Use the connecting leads to jump-start the
snowmobile only. Do not use the connect-
ing leads for any other purpose.
75