1972 Ski-Doo Shop Manual, Page 47Get this manual
1-08-01 Transmission
DRIVE PULLEY
GENERAL
The Drive Pulley is variable pitch pulley which transmits power from the engine to the driven pulley by means of drive beltBoth the inner and outer pulley halves of the drive pulley are made of aluminumThis metal is light weight, corrosion resistant and repels engine and belt heat during operation of the vehicleThe shaft of the pulley is made of steelA hollowed inner half pulley shaft contains reserve of Ski-Doo clutch lubeDuring pulley operation this grease is forced through the lubrication vent in the shaft and becomes trapped within the lubrication notch of the outer half pulleyFrom there, outer half pulley activation distributes the grease along the pulley shaft and the pulley is lubricated(See line drawing below)