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Troubleshooting
69
ESU12882
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 plug 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.
WARNING
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
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.
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 shroud and the right side
cover. (See page 43 for removal proce-
dures.)
3. Connect the red (+) jumper cable to the
positive (+) terminal of the discharged
battery.
4. Connect the other end of the red (+)
jumper cable to the positive (+) terminal
of the booster battery.
5. Connect the black (–) jumper cable to the
negative (–) terminal of the booster bat-
tery.
1. Throttle switch connector
U8GL10E0.book Page 69 Friday, May 18, 2007 3:17 PM