1978 Ski-Doo Shop Manual, Page 51Get this manual
SECTION 02 SUB-SECTION 04 (DRIVEN PULLEY)
Olympique, Nuvik,
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Fixed half Sliding half Release spring Outer cam Cam slider shoe Roll pin Disc Bolt 9Spacer
(REMOVAL
Remove pulley guard and drive beltRemove brake assembly and tool boxRemove chaincase coverRemove air silencer box and carburetorRelease chain tension then remove cotter pin and castellated nut securing driven pulley to chaincasePullout driven pulley assemblyTo correct spring tension either relocate spring end in sliding pulley half, or gradually rotate outer cam