Troubleshooting
89
ESU12397
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 check.
●
Fuel supplied to combustion chamber
• Flooded engine:
Crank engine 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.
[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 check.
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.
1. Throttle switch connector
1
U8GKS6E0.book Page 89 Tuesday, April 17, 2012 8:48 AM
