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Performance Tips
Operating a high performance snowmo-
bile requires a special attention that is not
required by a low performance snowmo-
bile. Often, a minor adjustment will
result in a large increase in performance.
This section is intended to highlight
minor conditions that adversely affect
performance and the adjustments needed
to correct them. Be sure, however, to
thoroughly read and understand this
entire manual especially the section on
spark plugs, track tension and alignment,
and suspension.
DRIVE BELT POSITION
Drive belt length, condition, and position are
all important for peak performance. To
check and adjust drive belt, remove the belt
guard; then use the following procedure.
NOTE:
Removing/adding
washers may be done by the snow-
mobile owner if qualified to do so. If
the owner does not feel qualified,
take the snowmobile to an autho-
rized Yamaha Snowmobile dealer for
this service. This service is at the
discretion and expense of the snow-
mobile owner.
1. Turn the engine off; then open the
left access panel.
2. Make sure the drive belt is posi-
tioned from 1.5 mm (0.06 in.) above
the edge of the driven clutch sheaves
to 0.5 mm (0.02 in.) below the edge.
! WARNING
If the belt is not positioned correctly,
the clutch engagement speed will be
changed. The snowmobile may move
unexpectedly when the engine is
started.
40
3. Adjust the position by removing or
adding a spacer on each adjusting bolt.
As the belt wears, adjustment may be
necessary. To ensure proper clutch
performance, the belt position should
be adjusted by adding a spacer (2) on
each adjusting bolt (1) whenever the
belt position reaches 1.5 mm (0.05 in.)
below the edge of the sheaves.
shim
Belt Position
More than 1.5 mm (0.06 in.)
above the edge
1.5 mm (0.06 in.) above the
edge to 0.5 mm (0.02 in.)
below the edge
More than 0.5 mm (0.02 in.)
below the edge
Spacer Part Numbers:
90201-061H1: 0.5 mm (0.02 in.)
90201-06037: 1.0 mm (0.04 in.)
4. Close the access panel.
DRIVE CLUTCH AND
DRIVEN CLUTCH
Keeping the drive clutch and driven
clutch clean should be the primary con-
sideration of the operator. The drive
clutch and driven clutch can be cleaned
of any drive belt accumulation using
compressed air. The sheaves can be
SNO-337
cleaned using a clean cloth and parts-
cleaning solvent.
CAUTION
Adjustment
No adjustment
Add a spacer
SNO-338
Remove a
spacer
necessary
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