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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).
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.
30
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.
Also, new drive belts have a break-in
period of approximately 40 km (25 miles).
After installing a new drive belt, drive the
snowmobile for 40 km (25 miles) at 3/4
throttle or less. By revving the engine up
and down (but not exceeding 97 km/h [60
mph]), the exposed cord on the side of a
0747-831
new belt will be worn down. This allows
the drive belt to gain its optimum flexibil-
ity and will extend drive belt life.
Never run the engine with the drive
belt removed. Excessive revving of the
engine could result in serious engine
damage and drive clutch failure.
Removing Drive Belt
NOTE: Changing a drive belt can be
done by the snowmobile owner if qual-
ified to do so. If the owner does not
feel qualified, take the snowmobile to
an authorized Yamaha Snowmobile
dealer for this service. This service is
at the discretion and expense of the
snowmobile owner.
1. Place the snowmobile on a level sur-
face and engage the brake lever
lock.
2. Open the left-side access panel and
remove the belt guard assembly.
3. Rotate the driven clutch sliding
sheave clockwise (1); then push
towards the engine (2) so it will sep-
arate from the fixed sheave.
4. Remove the drive belt by pulling it
up and over the fixed sheave.
CAUTION
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