Wossner / MCB Top End Rebuild Kit Fits: 1986-2006 Kawasaki KDX200 66mm bore Please specify the exact bore size you're looking for at checkout: STD 0.5mm over 1.0mm over 2.0mm over This top end kit features Genuine Wossner pistons that have CNC machined Superior profiles for peak HP and service life. Wossner uses a proprietary alloy in all its 2-stroke pistons that maintain conformability in severe conditions and decrease wear significantly. German quality at its best! NOTE: This kit also has a FULLY coated skirt for reduced break it time and dramatically decreased heat and scuffing! Each piston is built from race proven designs that are chosen by the top race teams in all forms of racing including Supercross, Motocross, GNCC, Superbike, and more, Wossner pistons are used by more MX teams internationally than all others combined! Premium dual ring kit, Top-End gasket set, 9310 alloy pin, clips, and caged pin bearing included.