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Congratulations!!
Yes they are mechanically loud, not so much for intake and exhaust flows.
Regarding valves, a positive cold compression test only indicates that the valves are properly closing.
If out of recommended clearance, one or more valves could remain partially open after the engine heats up (due to dilatation).
If the 2,100 miles are real, valves should have been adjusted at the first 500 miles.
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Motofool 
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