and Another Dr. D Question

Just put my new pipe(SS) on :thumbsup:my 08' YZ450. Jetting is not my forte. My elevation is 4300ft. Still running the stock jets (All). I am getting backfire on declaration. I've read most of the threads on this just not getting it :p Dr D recommends 162 main considering the elevation which way do i go??

Thank in advance!

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