Wiseco PK1249 67mm 2-Stroke Motorcycle Piston Kit with Top-End Gasket Kit Fits: Honda CR250 1990-1991 2-stroke kits feature the Pro-Lite pistons that are CNC machined for optimal cam shape and profile for peak HP and service life 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 Resistance to impact and fatigue Complete top-end gasket kit gives everything you need to complete your rebuild from premium materials