Run the engine with right side power valve cover removed. See if the power valve is rattling. The mechanism may not have enough tension to keep the power valve stationary at low RPM. The PV linkage rod could also be rubbing on the engine case.
The exhaust pipe could also rattle if it's sitting out of place. There is also a lot of clutch noise. Most of it goes away when you pull the clutch lever in.
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2011 EC250E
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