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Troubleshooting
76
ESU12396
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.
WARNING
EWS00580
● Connect the jumper cables only to the
battery 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 to each
other or to the frame or any metal part of
the snowmobile. This can cause electri-
cal system damage or A FIRE HAZARD.
1. Apply the parking brake and turn the
main switch to the off position.
2. Remove the right side cover. (See page
49 for removal procedures.)
3. Connect the red (+) jumper cable to the
positive (+) terminal of the discharged
battery.
U8GK12E0.book Page 76 Monday, May 19, 2008 11:17 AM