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i have an issue with my x20's with that similar sound. i have to keep chain on the tight side(not too tight) to avoid chain hitting the front sprocket cover on the lower side of it where is leaves to the rear sprocket when enough tension has developed in the chain, especially if you have a larger sprocket on it. i have contemplated on grinding off an inch or two on lower part of cover where the chain makes contact making clink clunk noise...this maybe a tangent problem for me but yours sounds very similar to my noise....after i take the play out of the chain to the tight side sound goes away, and i usually adjust jtr h2 chain 3 times from new. would take a few min to remove front sprocket cover and test ride to see if that's it....
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