Grew the company into a healthy company called Nippon Gakki Co.. Ltd.
The bike was meticulously copied from the German DKW RT125 showstopper
The base was the single cylinder 125cc two-stroke
THE FIRST 250 cc TWIN. The example of the first twin Yamaha would be the German Adler.
YD1 a fairly modern motorcycle, stripped by the Yamaha technicians