Had this on my 02 foxeye when I got it, turned out to be a combination of worn steering head bearings and a worn front tyre that had been run at too low a pressure, so caused some very odd wear pattern, the bearings being worn wasn't apparent until I took the front wheel out and turned the headstock, could feel the notch then. Replaced the tyres, front and rear, for bt 023's and also replaced the bearings myself, 4 hours, one hour for the bottom bearing and 3 for the top but did it, not had a problem since. My handlebar wobble was always at 40 mph with hands off, below or above that speed, was ok, handling is much better now anyway :-)