2005 Ski-Doo Tundra, Skandic, Expedition Shop Manual, Page 43Get this manual
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Section 02 TROUBLESHOOTING GUIDE Subsection 01 (ENGINE (2-STROKE))
ING RPM (500 TO 1000 RPM SLOWER)
1 Check RAVE valve pistons- Valve piston(s) is (are) not screwed to the bottomScrew valv