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backfire and jetting

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i bought an 07 kx250f, i noticed that on deacceleration it backfires, the owner before me put on a fmf powerbomb header, do i need to check the jetting out and what do i need to look for, how do i go about adjusting it?

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richen up the main jet by 1 to 2 jet sizes or open up the air fuel screw a half turn then test. If a half turn on the air/fuel doesnt work turn it a little bit more & test. Make sure when you are testing you do so on the track or trail. Not in the driveway with the bike not at full temp. Good luck.

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