2002 Ski-Doo Shop Manual Volume Three, Page 144Get this manual
Subsection 04
Section 04 ENGINE (LEAK TEST AND ENGINE DIMENSION MEASUREMENT)
8Install thicker or thinner cylindercrankcase gasket (refer to Parts Catalogs) in order to obtain the specified combustion chamber volume or the nearestENGINE TYPE 493 593 693 793 CHANGE IN COMBUSTION CHAMBER VOLUME (CC) FOR EVERY 0.1 mm (.004 in) OF GASKET THICKNESS 0.38 0.45 0.48 0.53
Using micrometer, measure piston skirt at 15 mm (.590 in) perpendicularly (90) to piston pin
USED PISTON MEASUREMENT
Note the measurement on the piston dome
F01D0NA
1Measuring perpendicularly (90) to piston pin axis A15 mm (.590 in)