1984 Ski-Doo Shop Manual, Page 185Get this manual
SECTION 03 TRANSMISSION SUB-SECTION 02 (DRIVE BELT)
Lift the countershaft upward approx50 mm (2 in and slip the belt between the shaft and the bearing cage to reove completely
To install the drive belt, reverse the procedure_ CAUTION: Once belt is installed, be sure to secure the counters haft bearing by closing the bearing cage and firmly tightening the retaining screw
Safari, SS-25Sonic LlC models
Unlock and raise the driven pulley support
Driven pulley support
NOTE: It may be necessary to loosen the brake adjustment in order to easily lift the countershaft