2009-2010 Ski-Doo REV-XP/XR 2 Stroke and REV-XR 1200 4-TEC Service Manual, Page 808Get this manual
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Section 02 ENGINE Subsection 08 (CYLINDER HEAD)
Replace valve springif out of specification
Valve Spring Installation
1 Valve spring compressor clamp 2 Valve sprmg compressor