2005 Ski-Doo Racing Handbook, Page 134Get this manual

2005 Ski-Doo Racing Handbook, Page 134

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SECTION 05ENGINE PREPARATION
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 Wrong spring tension (too