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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
sudden stop will be required until
the brake pads are properly bur-
nished.
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.
4. While holding the bolt with a
wrench, tighten the jam nut to 2.5
kg-m (18 ft-lb).
31
Jam Nut
Adjustment Bolt
Chain Adjuster
0747-831
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 1118-1126 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 spec-
ifications and of quality material.
Belts made by other manufacturers
may not be of the same specifica-
tions or quality and, therefore,
usage could result in poor perfor-
mance and premature belt failure.
NOTE: Before starting the snow-
mobile in extremely cold tempera-
tures, the drive belt should be
removed and warmed up to room
temperature. Once the drive belt is
at room temperature, install the
drive belt.
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