Not gonna work. I had the same idea. Basically it would be easier to wedge the XR motor in the KTM frame than to use that swingarm. An XR swingarm cradles around the frame, while the KTM swinger is solid across the very front and is cradled by the KTM frame. If it doesn't make sense now, look at one at your local friendly KTM dealer and then go...OHHHH.