I wouldn't worry about that noise. Honestly, my EC300 does it, and so does the majority of everyone else's. The noise goes away when u pull the clutch lever in, right? There's some threads on here that talk about it and it's never caused any issues (if it is in fact the same noise that I here). I also had a 2002 Honda CR125R that did the same thing. Ran it for years like that. The noise never got any better, or worse. It didn't effect performance at all.
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