2009-2010 Ski-Doo REV-XP/XR 2 Stroke and REV-XR 1200 4-TEC Service Manual, Page 782Get this manual
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Section 02 ENGINE Subsection 07 (TIMING CHAIN)
TIMING CHAIN GEAR
Timing Chain Gear Removal
1 Remove VALVE COVER, see procedure in CYLINDER HEAD subsection
5 Unscrew and remove