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03 yz450 Wont idle low

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Could use a little help... my 03 yz 450 f, when i bought it, it used to idle fine but had some popping from the rear exhaust under deceleration. i recently changed the main jet to 68. it use to be 60. and that helped a little but i cant get it to keep a low idle. occationally i can, but as soon as i give it gas it kickss up to a high idle... any suggestions

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ok eddie...thanks so much I will try that. just so im clear, the air fuel screw on the very bottom? I have an after market one in there that makes it real easy to turn, but do I set it at 2 1/2 turns out to begin with and then start adjusting? and do you know what the stock pilot jet is for this bike? thanks bro

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