Wiseco 4562M10100 101.00mm 8.7:1 Compression 657cc 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 3977XH ring set 657cc