2004 Skidoo ZX Series Service Manual, Page 156Get this manual
Section 04 ENGINES (2-STROKE) Subsection 03 (ENGINE LEAK TEST AND MEASUREMENT)
NOTE: When the combustion chamber is filled to top of spark plug hole, it includes an amount of 2.25 cc corresponding to the spark plug well Repeat the procedure for the other cylinderENGINE TYPE 377 552 593 593 HOSDI 693 793 HOSDI COMBUSTION CHAMBER VOLUME (cc) (up to top thread of spark plug hole) 20.35 0.8 35.54 1.2 26.67 1.291.18
F00D0EA
26.4 1.2 31.711.511.38 36.341.731.58
1Piston dome 2Piston measurement
Using micrometer, measure piston skirt at 15 mm (.590 in) perpendicularly (90) to piston pin
Install thicker or thinner cylindercrankcase gasket (refer to Parts Catalogs) in order to obtain the specified combustion chamber volume or the nearestENGINE TYPE 552 593 HOSDI 693 793 HOSDI CHANGE IN COMBUSTION CHAMBER VOLUME (cc) FOR EVERY 0.1 mm (.004 in) OF GASKET THICKNESS 0.45 0.41 0.48 0.53