Troubleshooting - Yamaha FX10B Owner's Manual

Troubleshooting

ESU12887
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 injector:
Ask a Yamaha dealer to inspect.
Fuel supplied to combustion chamber
G
• Flooded engine:
Crank engine or wipe the 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 the spark
plugs dry. Replace if necessary.
↓
• Faulty ignition system:
Ask a Yamaha dealer to inspect.
↓
• T.O.R.S. malfunction:
Disconnect the throttle switch con-
nectors and connect the wire har-
ness connectors together to bypass
the T.O.R.S. WARNING! Before by-
passing the T.O.R.S., make sure
that the throttle returns properly
to the fully closed position. The
T.O.R.S. is an important safety de-
vice; in the case of a malfunction,
take the snowmobile to a Yamaha
dealer immediately for repair.
[EWS00561]
82
1. Throttle switch connector
3. Compression
Insufficient
G
• 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 inspect.
Discharged battery
If the battery is discharged, the engine can be
started using a fully-charged 12-volt battery
and jumper cables.
EWS00580
WARNING
Connect the jumper cables only to the
G
battery terminals. Do not connect them
to the frame or any wire or other lead.
1