Wiseco Top End Kit .50mm / .020" 72.50mm Bore Piston Kits Includes (2) Pistons, (2) Sets of Rings, (2) Pins, (2) Pairs of C-Clips, (1) Top End Gasket Set (No Top End Bearings Included)
ITEM FITS:
537 Engine Type
1986-1988 Ski-doo Formula Plus 521
Twin Cylinder, 2-Stroke