2004 Skidoo ZX Series Service Manual, Page 552Get this manual

2004 Skidoo ZX Series Service Manual, Page 552

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Section 13 TECHNICAL DATA Subsection 02 (ENGINES)
BOMBARDIER-ROTAX 1004 4-TEC, 4-stroke, Over Head Camshaft (OHC), liquid cooled V2 valves with hydraulic lifters (no adjustment) 100 mm (3.937 in