2004 Ski-Doo Racing Handbook, Page 111Get this manual
SECTION 04ENGINE PREPARATION
10Repeat the procedure for the other cylinderENGINE TYPE 593 HO 793 HO COMBUSTION CHAMBER VOLUME (cc) (up to top thread of spark plug hole) 28.65 1.2 38.61.7,1.6
Using micrometer, measure piston skirt at 15 mm (.590 in) perpendicularly (90) to piston pin
11Install thicker or thinner cylindercrankcase gasket (refer to Parts Catalogs) in order to obtain the specified combustion chamber volume or the nearestENGINE TYPE 593 HO 793 HO CHANGE IN COMBUSTION CHAMBER VOLUME (cc) FOR EVERY 0.1 mm (.004 in) OF GASKET THICKNESS 0.41 0.53
F01D0NA
1Measuring perpendicularly (90) to piston pin axis A15 mm (.590 in)