2003 Ski-Doo ZX Series Factory Shop Manual, Page 146Get this manual
Section 04 ENGINE Subsection 04 (LEAK TEST AND ENGINE DIMENSION MEASUREMENT)
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 gauge4Inject the burette content through the spark plug hole until liquid touches the top spark plug hole
F00D0HA
1Top of spark plug hole
F01D2IA
1Bring piston to TDC
2Obtain graduated burette (capacity50 cc) and fill with an equal part (5050) of gasoline and injection oil