1989 Ski-Doo Repair Manual, Page 127Get this manual
Section 02 ENGINE Sub-section 05 (503 ENGINE TYPE)
NOTE ;'0 .25 and .0 .5 mm oversize piston and rings are available if necessary
INSPECTION
The inspection of the engine top end must include the following measurements :
TOLERANCES
NOTESpare parts pistons and cylinders are identified with green or red dot, it is important to match the piston with the cylinder of the same color
To center the piston pin with the connecting rod bearing, use centering tool (PIN 5290091 00)
MEASUREMENlS
FITTING NEW PARTS IMAX IMIN.I
N.A" .A NA N.A
WEAR LIMIT
(PlN 5290091 00l
Centering tool
Cylinder tsper Cylindef o"t of round Cylinder piston clearance Rin piston groove clearance