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Troubleshooting
106
Seized engine: Seizure is caused by poor
lubrication, inadequate fuel, or an air leak.
Ask a Yamaha dealer to check.
RST9N: “Hydrostatic lock” occurs when
fuel has filled cylinders during transporta-
tion of vehicle: Remove spark plugs and
turn engine over several times with ignition
off to expel excess fuel. Ask a Yamaha
dealer to check.
Engine power is low
Low coolant temperature indicator light is
flashing: Warm engine up.
Faulty spark plugs: Clean or replace spark
plugs.
RST9N: Incorrect carburetor jetting for alti-
tude or temperature: Ask a Yamaha dealer
to check.
Improper fuel flow: See “Engine turns over
but does not start–Fuel system” above.
Incorrect V-belt clutch settings for altitude
or conditions: Ask a Yamaha dealer to
check.
Engine constantly backfires or mis-
fires
Faulty spark plugs: Replace spark plugs.
Clogged fuel system: See “Engine turns
over but does not start–Fuel system”
above.
Malfunctioning T.O.R.S.: See “Engine turns
over but does not start–Electrical system”
above.
Engine overheats
Insufficient coolant: Add coolant.
Air in cooling system: Bleed cooling system
or ask a Yamaha dealer to check.
Leaking coolant: Ask a Yamaha dealer to
check.
Snowmobile does not move
Malfunctioning V-belt clutch: Ask a
Yamaha dealer to check.
Drive track does not move: Foreign object
is caught in drive track, or slide runners
have melted to slide metal due to lack of lu-
brication.
Tight, loose, or broken drive chain: Ask a
Yamaha dealer to check.
V-belt twists
Improper V-belt: Replace with correct V-
belt.
Incorrect V-belt clutch offset: Ask a
Yamaha dealer to check.
Loose or broken engine mount(s): Ask a
Yamaha dealer to check.
V-belt slips or becomes extremely hot
Oily or dirty V-belt or primary and second-
ary sheave assembly surfaces: Clean.
Problem with driveline: See “V-belt twists”
above.
Engine does not upshift or downshift
properly or engages harshly
Worn or damaged V-belt: Replace V-belt or
ask a Yamaha dealer to check.
Incorrect V-belt clutch settings for altitude
or conditions: Ask a Yamaha dealer to
check.
Worn or sticking primary sheave assembly:
Ask a Yamaha dealer to check.
Worn or sticking secondary sheave assem-
bly: Ask a Yamaha dealer to check.
Noise or excessive vibration in drive
chain and sprockets
Broken V-belt clutch components: Ask a
Yamaha dealer to check.
Worn or damaged bearings: Ask a Yamaha
dealer to check.
Worn or damaged V-belt with flat spots:
Replace.
Worn or damaged idler wheels or shafts:
Ask a Yamaha dealer to check.
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