Wiseco PK1763 76mm 12.8:1 Standard Compression 4-Stroke Motorcycle Piston Kit with Top-End Gasket Kit Fits: KTM 250 SX-F 2006-2012, XC-F/XCF-W 2007-2013 Piston domes are designed for optimal quench during the compression/combustion cycle, resulting in resistance to detonation and pre-ignition; the end product has longer engine life and increased horsepower potential 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