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Yamaha’s original XJ900 was biggest of a line of slim shaft-drive fours produced in the 80s that acquired a reputation as a wobbler. But John Nutting, who tested the bike at MIRA, thinks it’s undeserved…

Kawasaki’s GPz1100 cracked the 150mph barrier in 1983. But was the last and most potent of the big air-cooled Kawasaki fours the best of the bunch?

Thirty years on, the 500 triple’s fearsome reputation seems over-exaggerated. However, it still provides excitement by the shed load…

Rod Gibson’s tips on how to keep your four cylinder engine running smoothly…

A few big bore Yamaha XS650 versions found their way into sidecar outfits but, as far as solo racing was concerned, other more suitable machines were available. However, such rules do not necessarily apply in the world of the classic clubman…

Rod Gibson gets to grips with the science of camshaft design, and enters a world full of ramps, overlap, lift and durations. But will it make the bike go faster?

Honda’s CB750F was a desperate attempt to keep its ageing SOHC 750 in the ring with the new DOHC contenders from Kawasaki and Suzuki…

Kawasaki’s blisteringly fast two stroke 750 triple lit the tarmac when launched in 1972. It was the ultimate white knuckle ride…