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9-1
ESU00294
9-
TROUBLESHOOTING
A. 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 carbure-
tor.
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 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. system malfunction ... Discon-
nect the carburetor switch connectors
and connect the wire harness connec-
tors together to bypass the T.O.R.S.
WARNING
@
●
Before bypassing the T.O.R.S., make
sure that the throttle returns prop-
erly 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.
@
For MM600 / SX600
●
Short circuit in the lighting system, sig-
nal system and meter system (except
for the ignition system) ... Disconnect
the relay with the white coupler (not the
black coupler) to activate the ignition
circuit so that the engine can be
started. Ask a Yamaha dealer to
inspect the electrical circuits as soon
as possible.
1
Relay with the white coupler
3. Compression
Insufficient
●
Loose cylinder head nuts ... Tighten
nuts properly.
●
Worn or damaged gasket ... Replace
gasket.
●
Worn or damaged piston and cylinder
... Ask a Yamaha dealer to inspect.
E_8DG.book Page 1 Friday, June 29, 2001 4:20 PM