2004 Skidoo ZX Series Service Manual, Page 68Get this manual

2004 Skidoo ZX Series Service Manual, Page 68

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Section 03 TROUBLESHOOTING Subsection 01 (ENGINE)
NORMAL USE4 Melted andor perforated piston dome; melted section at ring end gapaWhen piston reaches TDC, mixture is ignited by heated areas in c