The Honda RC is a racing motorcycle. It was developed by Honda in the early 1970s for the Grand Prix motorcycle racing circuit. It is powered by a liquid-cooled, four-stroke, 180cc engine, and is used in the 50cc, 125cc, 250cc, and 350cc classes. The RC was developed by Honda as an alternative to its more successful two-stroke models, and has been used to great success in many racing series, including the Honda NS250 SuperSport and Honda NSR250 World Championship series.