MAINTENANCE PROCEDURES
Adjust drive belt height using Allen
screws. Loosen jam nuts then turns
Allen screws.
– To lower belt in driven pulley: turn
Allen screws clockwise.
– To raise belt in driven pulley: turn
Allen screws counterclockwise.
NOTE: Turn Allen screws 1/4 turn at
a time, then rotate driven pulley to al-
low drive belt to settle in pulley. Check
height, repeat as required.
mmr2007-201-006_a
NOTE: Allen screws must be re-
strained while tightening jam nut to
prevent throwing adjustment out.
Drive Pulley
Drive Pulley Adjustment Guidelines
The drive pulley is factory calibrated to
transmit maximum engine power at a
predefined RPM. Factors such as am-
bient temperature, altitude or surface
condition may vary this critical engine
RPM thus affecting snowmobile effi-
ciency.
This adjustable drive pulley allows set-
ting maximum engine RPM to maintain
maximum power.
Calibration screws should be adjusted
so that actual maximum engine RPM
matches the maximum horsepower
RPM.
ENGINE
MAXIMUM
HORSEPOWER RPM
550F 6900 RPM (± 100)
V800 7250 RPM (± 100)
NOTE: Use precision digital tachome-
ter for engine RPM adjustment.
NOTE: The adjustment has an effect
on high RPM only.
To adjust, turn calibration screws.
Calibration screw has a notch on top of
its head.
1
A33D19A
TYPICAL
1. Notch
There are 6 positions numbered 1 to 6.
Each position modifies maximum en-
gine RPM by about 200 RPM.
Lower position numbers decrease en-
gine RPM in steps of 200 RPM and
higher position numbers increase it in
steps of 200 RPM.
Example:
Calibration screw is set at position 4
andischangedtoposition6. Soma-
ximum engine RPM is increased by
400 RPM.
Drive Pulley Adjustment Procedure
WARNING
Remove tether cord cap from en-
gine cutout switch before perform-
ing any maintenance or adjust-
ment, unless otherwise specified.
Vehiclemustbeparkedinasafe
place, away from the trail.
_______________
73
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