Rocker arm shafts UMA Yamaha YZF-R 125

The rocker shafts from the renowned racing brand UMA Racing are located in the cylinder head and are designed for tuning systems. They control the precise valve opening and closing time and are therefore responsible for the Optimal Fuel Utilization. They have a special coating, with which they have less friction and so do not wear out as quickly as conventional rocker shafts.