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04 450r

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I must say this bike has been nothing but problems since I got it. Now it's hard as hell to start and when I did finally I took it around the corner and I heard a loud rattling noise and then it stalled out on me. What could this be? It almost sounded like there was a screw driver in the engine lol

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Does it still turn over easy?

No not at all. It's super hard to start.

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I'd stay its timed wrong or jumped a tooth on the cam,my 04 450 has a slightly noisy engine as well but not sounding like how you've discribed

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Sounds like maybe the cam chain tensioner went out and it jumped a tooth. May have done more internal damage to piston/valves as well. The initial hard starting could of been the result of zero'd out valve clearances or ???

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