2009-2010 Ski-Doo REV-XP/XR 2 Stroke and REV-XR 1200 4-TEC Service Manual, Page 136Get this manual
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Section 02 ENGINE Subsection 11 (RAVE (593 E-TEC))
Check Valve Installation
Ensure to reinstall all check valves in the proper directionCHECK VALVE ORIENTATION
LUBRICATION CHE