Arctic Cat 660 cc Service Manual page 230

2. Recheck both offset and parallelism to ensure
accuracy and make further adjustments as
necessary.
NOTE: After parallelism and offset have been
corrected, check for proper drive belt deflection.
This is critical for optimum performance.
DRIVE BELT DEFLECTION
Drive belt length, condition, and deflection are all
important for peak performance. To check and adjust
drive belt deflection, use the following procedure.
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1. Turn the engine off; then open the belt guard.
2. Make sure the drive belt is sitting at the top of the
driven pulley sheaves.
3. Place a straightedge on top of the drive belt. The
straightedge should reach from the drive clutch to
the top of the driven pulley.
4. Using a stiff ruler centered between the drive
clutch and driven pulley, push down on the drive
belt just enough to remove all slack. Note the
amount of deflection on the ruler at the bottom of
the straightedge. The deflection should be within
the range of 29-31 mm (1 1/8-1 1/4 in.).
NOTE: Push down on the belt with the ruler only
until the bottom of the belt flexes upward; then
read the amount of deflection.
5. To correct drive belt deflection, washers can be
removed or added between the stationary and
movable sheaves of the driven pulley.
NOTE: If the drive belt deflection is above speci-
fications, the snowmobile will bog and lack power
at clutch engagement. For good performance,
proper belt deflection is critical.
6. Secure the belt guard.
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