1985 Ski-Doo snowmobile Service Manual, Page 250Get this manual
Section 03 Sub-section 03
TRANSMISSION (DRIVE PULLEY)
INSPECTION
Drive pulley should be inspected annually
INSTALLA TION
Lock crankshaft in position as explained in removal procedureMake sure crankshaft is rotated 45 counterclockwise from T.D.C position and that cylinder is completely filled with starter ropeInstall governor cup correctly as per illustration making sure that the rollers are sliding on their ramp
5,9, Innerouter half
Check outer half for excessive lateral play and inner half shaft for scratches