 Yamaha showed their twin-rotor RZ-201 machine at the Tokyo Motor Show in 1972, while Kawasaki tested a prototype as, allegedly, did Honda.RE5 project chief Shigeyasu Kamiya stated that Suzuki had considered a rotary-powered motorcycle in the mid-1960s.Research and development continued till the end of that decade, leading to the signing of a technical licence with NSU in November 1970, Suzuki being the 20th firm to do so.