2004 Skidoo ZX Series Service Manual, Page 155Get this manual
Section 04 ENGINES (2-STROKE) Subsection 03 (ENGINE LEAK TEST AND MEASUREMENT) F01D5VA
1Combustion chamber
NOTE: When checking the combustion chamber volume, engine must be cold, piston must be free of carbon deposits and cylinder head must be leveled Remove both spark plugs and bring one piston to Top Dead Center using TDC gauge1
F00B0BA
1Graduated burette (050 cc)
Open burette valve to fill its tipAdd liquid in burette until level reaches cc Inject the burette content through the spark plug hole until liquid touches the top spark plug hole