1989 Ski-Doo Repair Manual, Page 332Get this manual

1989 Ski-Doo Repair Manual, Page 332

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Section 03 TRANSMISSION Sub-section 07 (CHAINCASE)
Position the sprockets with the writing facing the chaincase cover
12, Upper sprocket castellated nut
Torque to 53 N.m (39 Ibf.ft)I