2004 Skidoo ZX Series Service Manual, Page 266Get this manual

2004 Skidoo ZX Series Service Manual, Page 266

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Section 05 ENGINES (4-TEC) Subsection 06 (CYLINDER AND CYLINDER HEAD)
Refer to CRANKSHAFTDRIVE GEARS
cylinder head screws M11 no20 retaining cylinder head and cylinder to cylinder base1