Wiseco 4949M07800 78.00mm 13.1:1 Compression 249cc Motorcycle Piston Kit Wiseco's forged pistons are tougher and more durable than cast pistons, and will stand up to the abuse that high performance motorsport applications require Piston kits contain one piston, rings, piston pin and piston pin circlips Domed 4 valve piston with moly-coated skirts 7800YB ring set 249cc