Troubleshooting
74
ESU15080
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.
[EWS00562]
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. 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.
WARNING
EWS00571
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
1. Throttle switch connector
1
U8KWS1E0.book Page 74 Tuesday, May 17, 2016 1:49 PM