1985 Ski-Doo snowmobile Service Manual, Page 236Get this manual
Section 03 TRANSMISSION Sub-section 02 (DRIVE BELT)
lift the countershaft upward approx 50 mm (2 in.l and slip the belt between the shaft and the bearing cage to remove com pletely
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
Citation LS, LSE, Tundra, Tundra LT, Safari (all), Formula SS, SP, Mirage III
Unlock and raise the driven pulley supportDriven pulley support
06.007003022
NOTE: It may be necessary to loosen the brake adjustment in order to easily lift the countershaft