The WM engine series from Wacker Neusom offers advanced automotive technology designed to deliver improved performance, longer life, quieter operation and lower operating costs. The WM Series is an air-cooled engine line that uses chain-driven overhead cam (OHC) technology. This design offers high performance through more power, easier starting because of lower pulling force, longer life with 33-percent fewer moving parts in the valve train, lower maintenance and lower fuel consumption. The OHC technology allows the intake and exhaust valves to be positioned for optimum engine performance.