2004 Ski-Doo Racing Handbook, Page 110Get this manual
SECTION 04ENGINE PREPARATION
COMBUSTION CHAMBER VOLUME MEASUREMENT
The combustion chamber volume is the region in the cylinder head above the piston at Top Dead CenterIt is measured with the cylinder head installed on the engine
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1Combustion chamber
1Graduated burette (050 cc)
NOTE: When checking the combustion chamber volume, engine must be cold, piston must be free of carbon deposits and cylinder head must be leveled1Remove both spark plugs and bring one piston to Top Dead Center using TDC gauge1