Cam chains can make a rattly noise usaly worse at idle. I always double check the cam chain followers, those guides on either side of the cam chain. If they are worn or cracked they will let the new chain wear out. Also the cam chain tensioner. If it is a automatic one and the bike has some miles on it replace the tensioner. Speaking of tensioners, before I would replace a lower mileage cam chain I would double check the tensioner to make sure it is not stuck.
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