2009-2010 Ski-Doo REV-XP/XR 2 Stroke and REV-XR 1200 4-TEC Service Manual, Page 52Get this manual
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Section 02 ENGINE Subsection 03 (ENGINE MEASUREMENT)
1M icrometer sel to the plS fOn dImensIOn
4 Refer to PROCEDURE CONTINUA TlON WITH NEW OR USED PISTON further5W ith the icrometer