My 2002 Road King Classic also makes a noise @ around 2000rpm and continues in 5th gear at cruising speeds. It can be real noisy at times and not so noisy at other times. What about piston slap? It was mentioned to me that that could be the problem. Does anyone have more information on this? I don't want to ride with the windshield off to cover up the noise and I don't have a radio to turn up loud.