Wiseco 4677M09250 92.50mm 10.2:1 Compression 501cc ATV 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 3642XC ring set 501cc