1970-1979 Ski-Doo Snowmobiles Service Manual, Page 130Get this manual
POWER TRAIN DRIVEN PULLEY CAUTION Driven pulleys are matched to drive pulleys and engineDo not use pulleys not designed for your particular machine or improper operation may result
RemovalInstallation
1Remove drive beltNOTE: On T'NT FA models with selfadjusting pulley (Table 3), remove bolt and washer securing driven pulley and remove pulley