1989 Ski-Doo Repair Manual, Page 252Get this manual
Section 03
TRANSMISSION
(DRIVE BELT)
Sub-section 02
Decrease deflection
Increase deflection
NOTE: The top of the drive belt must be flush with the driven pulley edgeScrew or unscrew each Allen screw equally to obtain proper belt positionTurn Allen screws 14 turn at time, then rotate driven pulley to allow drive belt to settle in pulleyCheck again, repeat as required
Alpine II 503
Drive belt deflection is adjusted by loosening engine support nuts and moving engine backward or forward as requiredAllen screws with iam nuts
A01S 003 032
Allen screw should be restrained while tightening jam nut to prevent throwing adjustment outUse drive belt tension adjuster (PIN 529 0087 00),