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Troubleshooting
116
ESU14162
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 (RS90GT /
RS90LTGT / RST90GT):
Ask a Yamaha dealer to check.
• Clogged carburetor (RST90):
Clean carburetor.
● Fuel supplied to combustion chamber
• Flooded engine (RS90GT /
RS90LTGT / RST90GT):
Crank engine or wipe spark plugs
dry.
• Flooded engine (too much choke)
(RST90):
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.
[EWS00561]
RS90GT / RS90LTGT / RST90GT
RST90
3. Compression
● Insufficient
• Loose cylinder head nuts:
Tighten nuts properly.
U8JA11E0.book Page 116 Monday, June 14, 2010 10:22 AM