1985 Ski-Doo snowmobile Service Manual, Page 143Get this manual

1985 Ski-Doo snowmobile Service Manual, Page 143

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Section 02 ENGINE Sub-section 07 (503 ENGINE TYPE)
A001002002

,CAUTION: Circlips must not move freely in the groove after installationIf so, replace them
2,21, Cylinderspiston