I have this problem too and I am about to investagate whats wrong. I am going to change part 7 Left/Right Swing support and see if that does it. While I am at it buying parts, anything else I should consider replacing. btw, last year I had both boots replaced due to the boot rubbers breaking but thats all fixed under warrenty and I still hear the noise. it normally happens when I go over subtle bumps or when is turning at low speeds like leaving a gas station as I ride off the curb in a turn.