The KTM 690 Duke was a motorcycle developed for KTM's line of midrange LC4 single-cylinder engine supermoto, or naked motorcycles that began with the 1994 609 cc displacement Duke 620 or Duke I, follo

The KTM 690 series is a range of single cylinder 4-stroke motorcycles made by KTM. The 690's roots are in the first generation LC4 KTM 600GS from 1987. The follow-on 1994 KTM 620 Duke and the 1997 KTM