Performance Tips - Yamaha SR10RE Operator's Manual

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 impor-
tant 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.
3. Adjust the position by removing or
adding a spacer on each adjusting
bolt.
CAUTION
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 pri-
mary consideration of the operator. The
drive clutch and driven clutch can be
cleaned of any drive belt accumulation
SNO-337
using compressed air. The sheaves can be
cleaned using a clean cloth and parts-
cleaning solvent.
SNO-338
Adjustment
Remove a
spacer
No adjustment
necessary
Add a spacer
39