Wiseco 4872M07700 77.00mm 12.7:1 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 7700XU ring set 249cc