1982 Ski-Doo Shop Manual, Page 140Get this manual

1982 Ski-Doo Shop Manual, Page 140

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SECTION 02 ENGINE SUB-SECTION 07 (640 ENGINE TYPE)
Clean crankshaft extension (taper) Apply "Loctite 242" (blue, medium strength)Position magneto on crankshaft with the keyway and the cam notch