ProX .50mm / .020" Oversized 76.50mm Bore Piston Kits Includes (2) Pistons, (2) Sets of Rings, (2) Pins, (2) Pairs of C-Clip, and (2) Top End Bearings
ITEM FITS:
643 Engine Type (617cc)
1991-1992 Ski-Doo Mach 1 Rave Valve
1994 Ski-Doo Formula Z
Twin Cylinder, 2-Stroke
(2) 01.5591.050