2005 Ski-Doo REV Series Shop Manual, Page 126Get this manual
Section 03 ENGINES Subsection 05 (TOP END)
CAUTION: Always install new mono-hook circlipsIf circlip installation fails at the first attempt, always retry with new one because, on second attempt, the circlip will lose its normal retaining capabilitiesCAUTION: Circlips must not move freely after installation; if so, replace themBefore inserting piston in cylinder, lubricate the cylinder with new injection oil or equivalent
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Cylinder Head Cover, Cylinder Head and Cylinder