Notes on the racer:

* It was the first Yamaha to race outside of homeland Japan

* It was the first Japanese motorcycle to race in America (Catalina GP. In May 1958, Yamaha's President Kawakami attended the race).

* It was also the first Japanese motorcycle to race in an American AMA sanctioned event in Kansas City, ridden by AMA Hall of Fame member Roxy Rockwood) who finished 1st in the 250 cc class.

*It was also ridden by AMA Hall of Fame member Cal Rayborn. He once held the title as "Fastest man on two wheels". He won the El Cajun half mile TT on the Yamaha.

* It was the first real 250cc Racer built by Yamaha

* And the first twin cylinder racer built by Yamaha.

* In it's First Race ever entered, the Team placed 1st, 2^nd and 3rd at the 1957 Mount Asama race in Japan.