Troubleshooting - Yamaha GCH I 237 Owner's Manual

ESU12376
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 carburetor:
Clean carburetor.
 Fuel supplied to combustion chamber
• Flooded engine (too much choke):
Crank engine with throttle open or
wipe spark plugs dry.
2. Electrical system
 Poor spark or no spark
• Spark plugs are dirty with carbon or
are wet:
Remove carbon or wipe spark plugs
dry. Replace if necessary.
↓
• Faulty ignition system:
Ask a Yamaha dealer to check.
↓
• T.O.R.S. malfunction:
Disconnect throttle switch connec-
tors and connect wire harness con-
nectors together to bypass T.O.R.S.
WARNING! Before bypassing the
T.O.R.S., make sure that the throt-
tle 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.
1. Throttle switch connector
3.
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 suit-
able grounding point for jump-starting the en-
gine.
EWS00571
 Connect the jumper cables only to the
connecting lead terminals. Do not con-
[EWS00562]
nect them to the frame or any wire or
other lead.

Troubleshooting

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 check.
WARNING
1
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