1978 Ski-Doo Shop Manual, Page 33Get this manual
SECTION 02 SUB-SECTION 02 (DRIVE BELT)
DRIVE BELT
REMOVALINSTALLATION
When removing drive belt, always mark the rotation directionReinstall in same direction
TENSION ADJUSTMENT
For proper drive belt use, See Technical DataIf drive belt does not have the minimum recommended width, performance will be affected
Drive Belt Removal
Tilt cab and remove pulley guardOpen driven pulley by twisting and pushing the sliding halfHold in open position then slip slackened belt over top edge of pulleySlip belt from drive pulleyWARNING: Never start or run engine without drive belt installed