During the mid-1960s Yamaha had prolific riders in Read, Canadian Mike Duff and later Bill Ivy. In 1964, Read gave Yamaha their first world title when he won the 250cc class. He would repeat as champion the following year. For 1966, Yamaha would introduce a new, four cylinder 250cc bike. Teething problems with the new engine meant he would lose the crown to Hailwood. In 1967 he would battle Hailwood on his six-cylinder Honda all the way to the final round. They would end up tied but, Hailwood took the crown due to having five wins to Read's four. Read took over from Frank Perris in 1967 as representative for the Grand Prix Riders' Association.