‘It’s also possible KTM have fitted a secondary balance shaft’
engine management systems not only give more power but also increase fuel economy. There is also the possibility that KTM will have fitted a second balancer shaft in the cylinder head, as first seen on the firm’s 690 Duke launched at the end of 2015. This extra balancer shaft works to smooth out the low rpm engine response, giving near twin-like smoothness from a single cylinder.
The 390 Duke has been a stunning success for KTM around the world, and – in addition to the smaller capacity 125 and 200 Duke models – has helped the Austrian company become Europe’s biggest manufacturer by volume. The new Duke is also expected to gain a mid-capacity stablemate in 2017/8 in the form of a new 800cc parallel twin, as revealed in MCN last week.