TOP END PISTON KIT VERTEX 53.94MM RACE EVOLUTION YAMAHA WR125 05-21 YZ125 05-21ertex Pistons has introduced a new line called Race Evolution, specifically designed for 2 stroke off road racing applications. These high performance pistons have been rigorously tested by supported racing teams and feature several advancements tailored for competitive racing. Key Innovations: Reduced Top Land: Minimizes piston weight and optimizes combustion chamber dynamics, enhancing engine efficiency. Special 0. 8 mm Ring: This thinner ring