2006 Arctic Cat Y-6/Y-12 50cc and 90cc Service Manual, Page 46Get this manual
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16Install the chain guide and secure with the Allen-head cap screw and O-ringApply light coat of grease on the O-ring and tighten to specifications
18Install the oil expander ring in the bottom ring groove of the piston; then install the lower and upper scraper rings over the expander making sure the ends of the expander do not overlapStagger the scraper end gaps of the upper and lower rings according to the illustration19Install the second compression ring with the taper directed toward the piston dome; then install the top compression ring with the orientation mark directed toward the piston domeStagger the ring ends gaps according to the illustration