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Troubleshooting
ESU14162
Engine turns over but does not start
1.
Fuel system
No fuel supplied to combustion cham-
G
ber
• No fuel in tank:
Supply fuel.
↓
• Clogged fuel line:
Clean fuel line.
↓
• Clogged
RS90LTGT / RST90GT):
Ask a Yamaha dealer to check.
• Clogged carburetor (RST90):
Clean carburetor.
Fuel supplied to combustion chamber
G
• Flooded
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
G
• 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
116
injector
(RS90GT /
engine
(RS90GT /
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.
RS90GT / RS90LTGT / RST90GT
RST90
3.
Compression
Insufficient
G
• Loose cylinder head nuts:
Tighten nuts properly.
[EWS00561]
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