1985 Ski-Doo snowmobile Service Manual, Page 153Get this manual

1985 Ski-Doo snowmobile Service Manual, Page 153

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Section 02 ENGINE Sub-section 07 (503 ENGINE TYPE)
PIN 420 876 355

A009002013

9,14, ShimV-belt
Fan belt deflection must be 85 mm (1132") when applying force of 50