2004 Skidoo ZX Series Service Manual, Page 543Get this manual
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Section 13 TECHNICAL DATA Subsection 02 (ENGINES)
VM34590 210210 P-8 (159) 40 6BCY40 2.5 23.90 (.941 .040) N.A1650 Unleaded 87 (R+M)2 or higher Injection
VM34591 250250