2009-2010 Ski-Doo REV-XP/XR 2 Stroke and REV-XR 1200 4-TEC Service Manual, Page 796Get this manual
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Section 02 ENGINE Subsection 08 (CYLINDER HEAD)
IValve cover 2 Gasket
8 Remove spark plug tubes from valve cover
1 Cam follower spacer properly in place 2 Exlla ust cam