ProX .50mm / .020" Oversized 76.50mm Bore Piston Kit Includes Piston, Rings, Pin, C-Clip, and Top End Bearing
ITEM FITS: 643 Engine Type (617cc) 1991-1992 Ski-Doo Mach 1 Rave Valve 1994 Ski-Doo Formula Z Twin Cylinder, 2-Stroke