1999 Ski-Doo Factory Shop Manual Volume One, Page 55Get this manual

1999 Ski-Doo Factory Shop Manual Volume One, Page 55

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Section 03 TROUBLESHOOTING Subsection 02 (ENGINE)
4 Melted andor perforated piston dome; melted section at ring end gapaWhen piston reaches TDC, mixture is ignited by heated areas in combustion