Sorry I can't help you. I had a whistle that turned out to by wind over the mirror holes. They gave me some plugs and whistle is gone. I'll be watching your thread though. This is my first touring bike and every sound seems different. My last machine had loud pipes so I couldn't hear the fenders fall off...now I constantly wondering if "This is normal, or that is bad, what's that....but, like you, I still love this ride. Just getting used to it more and more each day. Good luck hope you get it solved