2004 Skidoo ZX Series Service Manual, Page 176Get this manual

2004 Skidoo ZX Series Service Manual, Page 176

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Section 04 ENGINES (2-STROKE) Subsection 06 (AXIAL FAN COOLING SYSTEM)
1 Screws 2 Cover

To remove or install fan pulley retaining nut no17, lock fan pulley with special holder wrenc