2009-2010 Ski-Doo REV-XP/XR 2 Stroke and REV-XR 1200 4-TEC Service Manual, Page 209Get this manual
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Section 03 ENGINE MANAGEMENT SYSTEM Subsection 01 (OVERVIEW (500S5600))
TEMEngine RPM Limiter
The ECM will limit the maximum engine speed (approximately 8600 RPM)