1989 Ski-Doo Repair Manual, Page 137Get this manual

1989 Ski-Doo Repair Manual, Page 137

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Section 02 ENGINE Sub-section 05 (503 ENGINE TYPE)
11,19, Flywheel22 mm lock washer
Position woodruff key, magneto flywheel and lock washer on crankshaft
7,20, Loctite 242nut
C