2010 Yamaha Motorsports FX Nytro MTX SE 153 Owners Manual - Page 79

2010 Yamaha Motorsports FX Nytro MTX SE 153 Manual

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Troubleshooting ESU12886 Engine turns over but does not start 1. Fuel system No fuel supplied to combustion chamber • No fuel in tank: Supply fuel. ↓ • Clogged fuel line: Clean fuel line. ↓ • Clogged injector: Ask a Yamaha dealer to inspect. G Fuel supplied to combustion chamber • Flooded engine: Crank engine or wipe the spark plugs dry. Electrical system G Poor spark 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. malfunction: Disconnect the throttle switch connectors and connect the wire harness connectors together to bypass the T.O.R.S. WARNING! Before bypassing 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 device; in the case of a malfunction, take the snowmobile to a Yamaha dealer immediately for repair. G [EWS00561] 1 1. Throttle switch connector 3. G 2. 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. Discharged battery If the battery is discharged, the engine can be started using a fully-charged 12-volt battery and jumper cables. EWS00580 WARNING G G Connect the jumper cables only to the battery terminals. Do not connect them to the frame or any wire or other lead. When connecting the jumper cables, do not contact the jumper cables to each other or to the frame or any metal part of the snowmobile. This can cause electrical system damage or A FIRE HAZARD. Apply the parking brake and turn the main switch to the off position. Remove the shroud and the right side cover. (See page 46 for removal procedures.) 1. 2. 73

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Troubleshooting
73
ESU12886
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:
Ask a Yamaha dealer to inspect.
●
Fuel supplied to combustion chamber
•
Flooded engine:
Crank engine or wipe the spark plugs
dry.
2.
Electrical system
●
Poor spark 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. 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]
3.
Compression
●
Insufficient
•
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.
WARNING
EWS00580
●
Connect the jumper cables only to the
battery terminals. Do not connect them
to the frame or any wire or other lead.
●
When connecting the jumper cables, do
not contact the jumper cables to each
other or to the frame or any metal part of
the snowmobile. This can cause electri-
cal system damage or A FIRE HAZARD.
1.
Apply the parking brake and turn the
main switch to the off position.
2.
Remove the shroud and the right side
cover. (See page 46 for removal proce-
dures.)
1.
Throttle switch connector
1