The most advanced forged 2-stroke piston available, the Racer Elite 2-Stroke series pistons feature 2000 series alloy, ArmorPlating piston coating, ArmorFit skirt coating, dedicated forging, premium quality rings and superfinish piston pins. Premium performance and durability. Extreme strength for extreme conditions. Protection from harmful detonation, improved ring seal.. Perfect fit and conformability to your cylinder bore. Greater strength and light weight. Enhanced sealing for each application. Reduced friction and smooth operation. More than 75 years as the industry performance leader. Piston Kit Bore 54.0mm