I went to my dealer , they pretty much said it was the cam chain tensioner but they downplayed it . They said Honda doesn't consider it a problem . It's just normal noise . It was explained to me that there is some kind of straight gear in there that is spring loaded , sometimes it just doesn't quite catch the next tooth , that's when it vibrates . They also said it will probably go away , just like it came on , as it wears in . They said it can't cause any damage . Also they would replace it if it becomes so loud that you can hear it while not under load . On my bike I only hear it when the bike is moving . Or I could schedule an appt for the Honda rep to hear it .
Just hearing them say that it can't cause damage has helped me to be at least a little more ok with it . The bike is just so damn awesome to not love it .