Wiseco 4466M07400 74.00mm 10.5:1 Compression 253cc 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 +6.00cc domed piston 2913XC ring set 253cc