1989 Ski-Doo Repair Manual, Page 332Get this manual
Section 03 TRANSMISSION Sub-section 07 (CHAINCASE)
Chaincase
Using two large screwdrivers inserted between chaincase and frame, pry complete assembly from vehicle
INSTALLATION
Reverse removal procedure and pay attention to the fol lowingReplace oil seals, gaskets and a-ringsRefer to section 05 -09 for drive axle axial play adjustment
INSPECTION
Visually inspect the chain for cracked, damaged or missing linksCheck for worn or defective bearings, sprockets and chain tensioner componentsWARNING: If chain deflection is greater than 38 mm (1.5 in) (without chain tensioner), replace chain and check condition of sprockets
19, Oil seal
Using an appropriate pusher, press the oil seal into chaincase hubOil seal must fit flush with the chaincase edge
GEAR RATIO MODIFICATION
For particular applications, the number of teeth of the sprockets can be increased or decreased on lower and upper sprocketsAvailable lower sprockets: 38, 40, 44, teeth Available upper sprockets: 20, 22 teeth Available chains: 68, 70, 72 links The chain length may be affected depending the com bination of lower upper sprocketsSelect chain length according to this chartGEAR RATIOCHAIN LENGTH CHART GEAR RATIO CHAIN LENGTH (LINKS) STANDARD ON