Background
Previously known only for off-road and racing motorcycles, the Duke was the firm’s first street bike. Launched in 1994, it went through a number of iterations but remained at heart a naked superbike with uncharacteristically long-travel suspension, a Supermoto if you like.
It started life with a 609cc engine, before gaining a 625cc engine in 1998, a 654cc unit in 2008, and finally 690ccs in 2012. Somewhat confusingly, the first two models were known as the 620 and 640 respectively, with the series III and IV both being known as the 690.
This means that the 640 you are looking at here is fitted with the 625cc engine, which boasts 54bhp and 44lb/ft of torque, enough to propel the 161kg bike to a top speed of 120mph after passing 60mph in under five seconds.
Never intended as a long-distance cruiser, the Duke is quirky and all the better for it. Motorcycle magazine Visor Down wrote of its long-term Duke II: “if you happen to get your backside on a lofty supermoto saddle you could quite possibly be hooked. I was, and have continued to be all year.”







