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'08 yz450f

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Hi ThumperTalk, My 2008 yz450f has been knocking VERY loud recently and it starting to make me wonder if I should ride it or not. The bike has a rekluse z-start pro in it. I've heard that it can either be the camchain or the crankshaft bearing? I might take the top end off tomorrow to see whats going on in there. What do you guys think it could be? Thanks :)

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