2004 Ski-Doo Racing Handbook, Page 67Get this manual

2004 Ski-Doo Racing Handbook, Page 67

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SECTION 04ENGINE PREPARATION
Troubleshooting
SYMPTOM Engine revs 500 to 1000 RPM lower than its maximum operational RPM; Rave valve is not openingCAUSE 1 Bent valve rod 2 Stuck valve 3 Wro