Having reached the point where the noises have been minimized but not entirely removed. Am now at the place where if I don't hear something anymore then it either failed completely or is laying on the road somewhere behind me.
As for the original poster I would add that it could very well be the belt ratcheting, hopping a tooth, while lighting out quickly. I had this happen to me a few times in the early days but I have since stopped it as the belt runs on the looser side as well as the practice eats the rear tire quickly!
Punching it to make a point or win a quick scratch race is all well and good but I have gone through three rear tires and five sets of fronts due to hard aggressive driving. It gets expensive.
