In 1964 , Read gave Yamaha their first world title when he won the 250cc class .
During the mid-1960s Yamaha had prolific riders in Read , Canadian Mike Duff and later Bill Ivy .
In 1964 , Read gave Yamaha Yamaha 's first world title when Read won the 250cc class .
During the mid-1960s Yamaha had prolific riders in Read , Canadian Mike Duff and later Bill Ivy .