Arctic Cat 660 cc, Service Manual

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8-4
4. Tighten the rear brake cable adjustment jam nut
securely; then adjust brake lever travel as
necessary. See Brake System (120 cc) in this
section.
A005
5. Compress and hold the brake lever; then install the
cap screw (coated with blue Loctite #243) and
washer securing the rear chain sprocket. Tighten
the cap screw securely; then release the lever.
6. Place the exhaust gasket into position on the
engine exhaust studs.
7. Place the muffler into position in the engine
compartment; then press down on the muffler and
swing the intake pipe onto the engine exhaust
studs. Secure with two nuts and the hold-down
spring.
8. Place the front and rear chain guards into position
making sure the hood cable is properly positioned.
Tighten securely.
Drive Belt
The belt dimensions and construction are two factors
that influence the performance of the drive system.
The two belt dimensions that are important to the per-
formance of the snowmobile are the outside circumfer-
ence and the width. Both of these dimensions will
influence shifting characteristics.
If the drive belt is longer than specified, the drive
clutch and driven pulley will not have the full shift
ratio. Also, a too-long drive belt will cause poor accel-
eration and a decrease in top speed.
If the drive belt is shorter than specified, the drive
clutch and driven pulley will have a different shift pat-
tern because they are in different ratios from those for
which they were originally matched. A too-short drive
belt will cause a loss in performance and a bog on
engagement.
„ NOTE: A drive belt that is worn thin may produce
the same effect as one that is too long.
Drive belt construction has an influence on the way the
drive clutch and driven pulley will shift and on the
amount of power that will be transmitted through the
system. ONLY ARCTIC CAT DRIVE BELTS
SHOULD BE USED. Different brands of belts may
not have the same construction causing either more
friction or more slippage when the belt is wedged
between the sheaves and, thus, a loss of efficiency.
„ NOTE: A stiff belt causes a HP loss to the track.
As a belt warms up, it gets more flexible and trans-
mits power with less HP loss.
Removing/Installing
Drive Belt
(ACT Roller Driven Pulley)
1. Turn ignition key to the OFF position and wait for
all moving parts to stop.
2. Set the brake lever lock.
3. Open the hood; then open the belt guard.
4. Remove the driven pulley plug from the belly pan.
5. Using the Drive Belt Deflection Tool (p/n 0644-
412), remove the sheave adjuster from the end of
the driven pulley. Account for and remove the O-
ring and shim washers. Note the orientation of the
components for installing purposes.
739-266B
6. With the O-ring and shim washers removed,
carefully thread the sheave adjuster back into the
driven pulley; then tighten the adjuster with the
deflection tool until it bottoms against the driven
shaft.
„
NOTE: By bottoming the sheave adjuster against
the driven shaft, the sheaves of the driven pulley
will spread far enough to allow the removal of the
drive belt.
7. Remove the drive belt from the drive clutch and
driven pulley.