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Troubleshooting
119
Engine power is low
● Low coolant temperature indicator light is
flashing: Warm engine up.
● Faulty spark plugs: Clean or replace spark
plugs.
● RST90: 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 lubrica-
tion.
● 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: Re-
place.
● Worn or damaged idler wheels or shafts:
Ask a Yamaha dealer to check.
● Worn or damaged drive track: Ask a
Yamaha dealer to check.
U8JA11E0.book Page 119 Monday, June 14, 2010 10:22 AM