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FWIW, I have a friend with a 2013 CRF450R and as far as I know he hasn't had any problems with it.
If you can, take it back to the dealership (I know, again!!) and make them ride it up and down the yard (or the street, whatever) and they can sort it out right there and then. If it's buggered, it's buggered, there'll be no argument then. If it's rooted, I can't see how they'll get out of swapping it for a decent one giving your money back.
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