2009-2010 Ski-Doo REV-XP/XR 2 Stroke and REV-XR 1200 4-TEC Service Manual, Page 817Get this manual
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Section 02 ENGINE Subsection 09 (CYLINDER BLOCK)
1 Unscrew flat head screw, securing ba ll bearing in place
reinstall ball bearing that has been removedUnless otherwise in structed, never