1985 Ski-Doo snowmobile Service Manual, Page 151Get this manual

1985 Ski-Doo snowmobile Service Manual, Page 151

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Section 02 ENGINE Sub-section 07 (503 ENGINE TYPE)
Clean crankshaft extension taper Apply Loctite 242 (blue medium strength) on taper

11,19, Flywheel, lockwasher 22 mm, woodruff key