1978 Ski-Doo Shop Manual, Page 50Get this manual
SECTION 02 SUB-SECTION 04 (DRIVEN PULLEY)
DRIVEN PULLEY
Elan and Spirit
Fixed half Sliding half Release spring Outer cam Cam slider shoe Roll pin
REMOVAL
Remove pulley guard, drive belt and mufflerSlacken steering column boltsRelease chain tensionRemove cotter pin and nut securing pulley drive shaft to chaincase
(Refer to Technical Data for correct spring tension)To correct spring tension, either relocate spring end in sliding pulley half or gradually rotate outer cam