Wiseco 4665M04950 49.50mm 9.7:1 Compression 83cc 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 1949XE ring set 83cc