2004 Skidoo ZX Series Service Manual, Page 154Get this manual

2004 Skidoo ZX Series Service Manual, Page 154

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Section 04 ENGINES (2-STROKE) Subsection 03 (ENGINE LEAK TEST AND MEASUREMENT)
ENGINE TYPE All MAXIMUM 0.10 mm (.004 in)

Compare cylinder diameter 16 mm (58 in) from top of cylinder