In early 1972, Kawasaki understood the potential of the growing motocross market and decided to design weapons for motocross. At the beginning, the firm invested with factory motorbikes. In 1974, Kawasaki launched its first 125 for amateur customers. This race bike was strongly derived from the trail bike. The 125 KX evolved by small keys until 1978. It will be necessary to wait for the model 1980 so that the Hamamastsu company proposes its first modern cross with suspension monoshock: the Unitrack.