Throughout the 1970s, after Honda left the international racing world, WGP and other sprint races were raced mostly by two stroke machines. In WGP, as well as Daytona, Yamaha, Suzuki and Kawasaki’s two stroke machines were largely successful and this trend influenced the Japanese championship at the same time. In this era, four stroke machines seemed as if they had lost their ground in the racing scheme, but in the production model based European endurance racing, the four stroke machines continued to be strong.