Hello, Iâve been lurking for a while and trying to read as much as I can about the KTM 640. Iâve ridden dirt bikes in the past and Iâm looking into getting a dual sport to ride with my brother. Anyway, the KTM 640 looks promising, but I havenât decided on new versus used. Does anyone know the major differences from model year 2000 â 2004 (I know 2005 changes based on the current brochure). Is there anything specific I should look out for (i.e., potential issues) on a used 2000 â 2004 â if I go that route. Lastly, about how many miles will a well maintained 640 go before a major engine overhaul? Thanks for your help. Great site!