The Barry Sheene bike we have here is a square-four 1975 Suzuki RG500 XR14. Sheene won his first ever GP on it and the '76 and '77 world championships.

In the yellow corner is an inline-four-cylinder 1980 Yamaha YZR500 OW48R, ridden by three-time world champion 'King' Kenny Roberts, complete with two reverse cylinders (hence the 'R').

Both are excessively loud, smelly two-strokes, with wafer-thin powerbands and no interest whatsoever in suffering fools gladly.

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