2004 Skidoo ZX Series Service Manual, Page 263Get this manual

2004 Skidoo ZX Series Service Manual, Page 263

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Section 05 ENGINES (4-TEC) Subsection 06 (CYLINDER AND CYLINDER HEAD)
NOTE: At installation, replace the O-rings no4 and no9 Slightly grease the O-rings before assembly using super lube greaseFo