1985 Ski-Doo snowmobile Service Manual, Page 205Get this manual

1985 Ski-Doo snowmobile Service Manual, Page 205

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Section 02 ENGINE Sub-section 10 (ENGINE DIMENSIONS MEASUREMENT)
b) Measure the thickness of each ball bearing (M4 and )
thlckness
Bearing

To summarize
A= M1M2M3M4