2009-2010 Ski-Doo REV-XP/XR 2 Stroke and REV-XR 1200 4-TEC Service Manual, Page 56Get this manual
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Section 02 ENGINE Subsect ion 03 (ENGINE MEASUREMENT)
TYPICAL Combus tion chamber
NOTE: hen checking the combustion chamber volumeengine must be coldpiston must be free of carbon de