1986 Ski-Doo Factory Shop Manual, Page 151Get this manual
Section 02 ENGINE Sub-section 07 (503 ENGINE TYPE)
NOTE: Spare parts pistons an.d cylinders are identified with green or red dotit is important to match the piston with the cylinder of the same color
To minimize the effect of acceleration forces on circllp, Install each circlip so the circlip break is at o'clock as IllustratedRemove any burrs from piston caused through circlip installation using very fine emery cloth
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Or use exhaust manifold align oylinders
18,19,20, Noise dampers
Circlip break
For proper position of nOise dampers, refer to the followif1g illustrations,