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ESU04240
T ROUBLESHOOTING
9 -
A. Engine turns over but does not start
1. Fuel system
No fuel supplied to combustion cham-
ber
G
No fuel in tank ... Supply fuel.
G
Clogged fuel line ... Clean fuel line.
G
Clogged carburetor ... Clean carbure-
tor.
Fuel supplied to combustion chamber
G
Flooded engine (too much choke) ...
Crank engine with throttle open or wipe
the spark plugs dry.
2. Electrical system
Poor or no spark
G
Spark plugs are dirty with carbon or are
wet ... Remove carbon or wipe the
spark plugs dry; replace if necessary.
G
Faulty ignition system ... Ask a Yamaha
dealer to inspect.
G
T.O.R.S. system malfunction ... Discon-
nect the throttle switch connectors and
connect the wire harness connectors
together to bypass the T.O.R.S.
WARNING
@
G
Before bypassing the T.O.R.S., make
sure that the throttle returns prop-
erly to the fully closed position.
G
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.
@
3. Compression
Insufficient
G
Loose cylinder head nuts ... Tighten
nuts properly.
G
Worn or damaged gasket ... Replace
gasket.
G
Worn or damaged piston and cylinder
... Ask a Yamaha dealer to inspect.
B. Starting the engine with a dis-
charged battery
If the snowmobile battery is discharged,
the engine can be started using a 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
suitable grounding point for jump-starting
the engine.
WARNING
@
G
Connect the jumper cables only to
the connecting lead terminals. Do
not connect them to the frame or
any wire or other lead.
G
When connecting the jumper cables,
do not contact the jumper cables or
connecting 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.
@
CAUTION :
@
Use the connecting leads to jump-start
the snowmobile only. Do not use the
connecting leads for any other purpose.
@
1. Apply the parking brake and turn the
main switch to "OFF".
9-1
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