Steve Cooper looks at how Yamaha took its all-new YR1 and jumped aboard the 1960s street scrambler trend. In 1967, Yamaha’s Iwata factory rolled out its most significant machine since the 250cc two-stroke YDS1 of 1959. The all-new Yamaha YR1 350 two-stroke twin was a ground-up design featuring a vertically split crankcase and a clutch…
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