43
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 shim
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
snowmobile 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.
SNO-337
3. Adjust the position by removing or
adding a spacer on each adjusting
bolt.
SNO-338
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
cleaned using a clean cloth and parts-
cleaning solvent.
WARNING
If the belt is not positioned cor-
rectly, the clutch engagement speed
will be changed. The snowmobile
may move unexpectedly when the
engine is started.
CAUTION
As the belt wears, adjustment may
be necessary. To ensure proper
clutch performance, the belt posi-
tion 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.
Belt Position
Adjustment
More than 1.5 mm (0.06 in.)
above the edge
Remove a
spacer
1.5 mm (0.06 in.) above the
edge to 0.5 mm (0.02 in.)
below the edge
No adjustment
necessary
More than 0.5 mm (0.02 in.)
below the edge
Add a spacer
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U8JRS2E0.book Page 43 Thursday, May 7, 2015 2:25 PM
