First Engineering group: General Manager Mr. Daisuke Tanaka, Mr. K. Morinaga (who later became the originator of the 5-valve system , Deltabox and other technology of the mid 80's Yamaha's and who sadly passed away) and Mr. H. Sakuma.

Testing: K. Tuchiya, K. Yamaji

5) Process of the develop­ment

At the early stage also a 650 cc 2 stroke twin was conside­red next to the 4 stroke twin. But the 2 stroke was banned because of the unfavourable exhaust note. The project was officially commenced in August 1967.