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Generally thought to be a problem from 2007 to 2009 model years. There have been several part updates of chains, sprocket and tensioners. I've seen no reports of chain breaks after 2011 although some spotty reports of chain rattling, but no breaks. It is a pain to fix a rattling chain, but they did do something to make it a little easier: The sprocket is not welded to the camshaft anymore necessitating a total replacement of cam to replace the sprocket.
I researched this quite extensively when I bought mine.
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