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Troubleshooting
78
ESU12384
Engine turns over but does not start
1. Fuel system
● No fuel supplied to combustion cham-
ber
• 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 con-
nectors and connect the wire har-
ness connectors together to bypass
the T.O.R.S. WARNING! Before by-
passing 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 immediately for repair.
[EWS00561]
3. Compression
● Insufficient
• Loose cylinder head nuts:
Tighten nuts properly.
↓
• Worn or damaged gasket:
Replace gasket.
↓
• Worn or damaged piston and cylin-
der:
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.
WARNING
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.
U8FP15E0.book Page 78 Thursday, July 23, 2009 11:01 AM