BP Racing - RZR800 RZR 800 83mm 820cc Big Bore Kit Fits RZR, RZRs, RZR-4, all years and models Includes cylinder, pistons, rings, pins, clips, gasket set Gasket Set Includes Head, Base, Chain Tensioner, and Exhaust Gaskets 10.75:1 pistons work on pump or race gas Core required