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9850064 R03 - 2021 650 / 850 Matryx Trail Performance / Crossover Snowmobile Service Manual
© Copyright Polaris Inc.
BELT WEAR / BURN DIAGNOSTICS
POSSIBLE CAUSE
SOLUTION
Driving at or about engagement RPM for extended
periods of time in any type of snow condition.
Drive at a higher RPM if possible. Gear the machine
down. Make sure belt deflection is at 1 1/4” to achieve
optimum starting ratio.
Cold weather startups
Be patient. Warm up the engine at least 5 minutes or until
it readily responds to throttle input. For the quickest most
efficient drive away in extreme cold weather, take the
drive belt off the machine and bring it in to a warm
environment. Break the skis and track loose from the
snow. Engage the throttle aggressively for short durations
for an initial cold drive away.
Towing another machine at or about engagement RPM
When possible, do not go in deep snow when towing
another machine. Use fast, effective throttle to engage
the clutch. Not all machines are intended for pulling heavy
loads or other machines.
Spinning track while vehicle is stuck (high RPM, low
vehicle speed, high ambient temp. Example: 8000 RPM,
10 mph actual vehicle speed and 60 MPH indicated on
speedometer.
Lower the gear ratio. Remove windage plates from the
driven clutch. If possible, move to better snow conditions
and reduce RPM. Avoid riding in very high ambient
temperatures.
Ice and snow piled up between the track and tunnel
overnight or after stopping for a long period of time
(enough to re-freeze the snow).
Break loose snow and ice under the tunnel. Allow a
longer than normal warm-up. Allow the belt to warm
sufficiently and increase grip ability on clutch sheaves.
Use fast, effective throttle when engaging the clutch.
Poor running engine (Bog, Miss, Backfire, etc.)
Maintain a good state of tune including throttle and choke
synchronization. Check for fouled spark plug(s). Check
for foreign material in the carburetors. Make sure no
water or ice is present in the fuel tank, lines, or
carburetors.
Loading the machine on the trailer
Use caution when loading the machine. Carbide skags
may gouge into the trailer and prevent the drive train from
spinning freely. Use enough speed to drive completely
onto the trailer. If the machine cannot be driven
completely onto the trailer, it may need to be pulled or
pushed to avoid belt wear / burning.
Clutch malfunction
Check for correct clutch components or damage on the
clutch.
Slow, easy belt engagement - easing on the throttle
Use fast, effective throttle to engage the clutch.
