2003 Ski-Doo ZX Series Factory Shop Manual, Page 149Get this manual
Subsection 04
Section 04 ENGINE (LEAK TEST AND ENGINE DIMENSION MEASUREMENT)
RINGPISTON GROOVE CLEARANCE
Using feeler gauge check clearance between rectangular ring and grooveReplace piston if clearance exceeds specified toleranceRefer to TECHNICAL DATA
CRANKSHAFT DEFLECTION
Crankshaft deflection is measured with dial indicator
Measuring (in crankcase)
First, check deflection with crankshaft in crankcaseIf deflection exceeds the specified tolerance, recheck deflection using V-shaped blocks to determine the defective part(s)See below
Measuring (on bench)
Once engine is disassembled, check crankshaft deflection on V-shaped blocksIf deflection exceeds the specified tolerance, it can be worn bearings or bent crankshaftRemove crankshaft bearings and check deflection again on V-shaped blocks to determine the defective part(s)See measurement in following illustrationA01C0PA