Troubleshooting
69
ESU12374
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 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. Two connecting leads
have been provided for jump-starting the
snowmobile. Due to the rubber engine mount-
ing, the snowmobile frame is not a suitable
grounding point for jump-starting the engine.
WARNING
EWS00570
●
Connect the jumper cables only to the
connecting lead terminals. Do not con-
nect them to the frame or any wire or
other lead.
●
When connecting the jumper cables, do
not contact the jumper cables or con-
necting lead terminals to each other or
to the frame or any metal part of the
snowmobile. This can cause electrical
system damage or A FIRE HAZARD.
U8GS14E0.book Page 69 Wednesday, May 19, 2010 10:45 AM
