The Duke R bears the most cutting-edge single-cylinder engine in the world in its most powerful form: Apart from a full 690 cc, the legendary LC4 uses a freer-breathing Akrapovic titanium silencer for a deeper bass and an extra two horses as a result. 70 hp all in all - or one and a half able-bodied 125 Duke's more than the next strongest single-cylinder competitor. The 690 Duke R has adopted such well-known series production goodies as the slipper clutch and active engine casing ventilation. Genuine ride-by-wire also provides it with unexpectedly smooth, yet always immensely explosive power development; twin ignition with plug-selective mapping ensures the most effective combustion and sensationally low fuel consumption. Add to these service intervals of 10,000 km – never has it been as elegant, cultivated, sporty and effective to be powered by one cylinder. And never has the need for more cylinders been more questionable, since these horses make very light work of the lightweight 690 Duke R.