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2008 yz450f major bogg / back fire need help!!

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hey guys recently just got a 08 450f brand new broke it in properly and now when I start it I warm it up then when I rev it a bit motor boggs and big time back fire? also when i am driving same thing bog about 1/2 throttle and when I get off the gas major back fire? need help is there any thing can adjust to fix this?

thanks steve

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