2005 Ski-Doo REV Series Shop Manual, Page 109Get this manual
Section 03 ENGINES Subsection 05 (TOP END)
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With round end of pusher, position circlip perpendicular to the support axis
CIRCLIP READY TO BE INSTALLED ON PISTON
Using plastic hammer, tap pusher to insert circlip in placeTake care to install new circlips with tab toward top as per following photo
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With the other end of the pusher, push circlip into the support groove