Troubleshooting - Yamaha FX Nytro FX10X Owner's Manual

ESU12882
Engine turns over but does not start
1. Fuel system
No fuel supplied to combustion chamber
No fuel in tank: Supply fuel.
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Clogged fuel line: Clean fuel line.
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Clogged injector: Ask a Yamaha dealer
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to inspect.
Fuel supplied to combustion chamber
Flooded engine: Crank engine or wipe
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the spark plug dry.
2. Electrical system
Poor spark or no spark
Spark plugs are dirty with carbon or are
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wet: Remove carbon or wipe the spark
plugs dry. Replace if necessary.
Faulty ignition system: Ask a Yamaha
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dealer to inspect.
T.O.R.S. malfunction: Disconnect the
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throttle switch connectors and connect
the wire harness connectors together
to bypass the T.O.R.S.
1. Throttle switch connector
EWS00560
WARNING
Before bypassing the T.O.R.S., make
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sure that the throttle returns properly to
the fully closed position.

Troubleshooting

The T.O.R.S. is an important safety de-
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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
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properly.
Worn or damaged gasket: Replace
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gasket.
Worn or damaged piston and cylinder:
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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.
EWS00580
WARNING
Connect the jumper cables only to the
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battery terminals. Do not connect them
to the frame or any wire or other lead.
When connecting the jumper cables, do
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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.
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