1985 Ski-Doo snowmobile Service Manual, Page 198Get this manual

1985 Ski-Doo snowmobile Service Manual, Page 198

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Section 02 ENGINE Sub-section 09 (537 ENGINE TYPE)
1,5, Rotary valve coverrotary valve
A gap of 0.270.48 mm LOll.019") must be maintained between the rotary valve and the crankcaseTo measu