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1. Choose an area sufficiently large to
safely accelerate to 50-65 km/h (30-
40 mph) and to brake to a stop.
NOTE: This procedure can also be
accomplished using a shielded jack
stand.
2. Accelerate to 50-65 km/h (30-40
mph); then compress brake lever to
decelerate to a stop.
NOTE: Lightly apply the brake lever
to come to an easy stop; do not over-
apply brakes or "lock up" the track.
3. Repeat procedure 10-15 times allow-
ing some cooling between stops.
NOTE: Do not repeat too soon or
too aggressively as to get the brake
disc "red hot."
! WARNING
Do not attempt sudden stops or put
yourself into a situation where a sud-
den stop will be required until the
brake pads are properly burnished.
NOTE: This procedure stabilizes
the pad material and extends the life
of the pads.
Chain Tension
1. Remove the shroud, right-side cover,
and exhaust assembly.
2. Loosen the jam nut.
3. Turn the chain tension adjustment
bolt clockwise until it is finger tight;
then loosen it 1 1/2 turns.
30
4. While holding the bolt with a
wrench, tighten the jam nut to 2.5
kg-m (18 ft-lb).
5. Install the exhaust assembly with a
new gasket.
6. Install the right-side cover and the
shroud.
NOTE: Check that the harness is
installed correctly.
Drive Belt
The drive belt transfers power from the
drive clutch to the driven clutch. If the
belt is worn, cracked, or stretched, maxi-
mum power will not be transmitted and
the belt could also fail and therefore must
be replaced. Periodic checks (at least
once a month under normal usage) of two
drive belt specifications are essential.
1. Measure the outside circumference of
the drive belt. The belt should be
within 1118-1125 mm (44.0-44.3 in.).
2. Measure the outside width of the drive
belt. The belt should be at least 34.5
mm (1.36 in.) on a new belt or 32.5
mm (1.28 in.) on a broken-in belt.
3. Check the belt for cracking, fraying, etc.
If any of the specifications or conditions
are unsatisfactory, replace the drive belt.
NOTE: Drive belts should be pur-
chased from an authorized Yamaha
Snowmobile dealer, as Yamaha drive
belts are made to exact specifica-
tions and of quality material. Belts
made by other manufacturers may
not be of the same specifications or
quality and, therefore, usage could
result in poor performance and pre-
mature belt failure.
NOTE: Before starting the snowmo-
bile in extremely cold temperatures,
the drive belt should be removed and
warmed up to room temperature.
Once the drive belt is at room tem-
perature, install the drive belt.
0747-831
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