Seat height: 900mm. Fuel capacity: 12l. Top speed: 110mph (est) Colours: Orange. For ‘08 KTM have introduced three new bikes based around their phenomenal 690 LC4 motor that first appeared to much acclaim in the ‘07 690 SM. Sitting at the head of this new family is the 690 Duke. The original Duke was ground-breaking when it appeared in 1994 XIGG9k.