KB Performance Piston Parts & Accessories

KB Performance Piston make pistons and piston kits for Harley-Davidson Big Twin and Sportster engines — stock replacement and performance applications, with options across compression ratios and bore sizes for everything from a standard rebuild to a serious performance build.

Advanced casting and machining delivers precise dimensional accuracy and proper ring sealing under the demanding conditions of air-cooled V-twin engines. A trusted name among builders who won't compromise on quality.