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mavis0826

07 wr450 to 09 yz450 jetting question

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my 07wr450 with all the crap done that you have to do plus a full Dr D set is jetted with JD kit red needle 165 main and runs great. Don't know if I really need to go with the JD kit in my 09 yz450. If the WR runs good, hows the stock YZ needle compair to the JD needle? Can I jet it the same? I'm in Utah so anywhere from 3000-7000ft. This bikes only going to see the track so I don't need to jet above 7000ft.

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