The latest generation is easily the best 390 yet. The LC4 reached the peak of its power with the 690 Duke R. It defies logic that a single cylinder can make this much power, but it does ...

At the time of launch, the redesigned Duke II was the most powerful street-legal single-cylinder money could buy (a mantle now taken up by the 74bhp unit in the KTM 690 Enduro R and Husqvarna 701 ...