All the GG 2t's seem to rattle a bit from the power valve, including mine. If it is the power valve you should notice fluctuations in it with RPM changes. Mine would really rattle when lugged just before it came on the pipe. I think its just where its working. Made me worry pretty good, thought it was a piston skirt slapping or something. Look through the threads, lots of them on there about this.
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2006 EC300, 2000 XR650R, 2003 EC250, 2001 EC200 (OK, the last two are really my sons).
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