PROX Exhaust Valve and Spring Kit Yamaha WR / YZ 250 14-18

ProX Racing Parts was founded in 1975. Based in Holland, ProX Racing Parts is now distributed in many countries around the world. The company specializes in high-quality internal engine components such as pistons, connecting rods, crankshafts and valves. However, ProX Racing Parts is constantly expanding its range and therefore investing in other technical components. All parts are manufactured to the highest quality standards in "state-of-the-art" manufacturing facilities worldwide. These manufacturing plants house reputable companies that produce OEM (Original Equipment Manufacturing) parts for leading motorcycle brands worldwide. With experience and long-standing relationships, ProX Racing Parts is always able to select the best manufacturer to meet or exceed the high specification and market requirements.