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06 crf250r jetting help

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I live in central louisiana with 0-1000ft sea level..i have a megabomb header and fmf factory 4.1 slip on's...any suggestions on how i need to jet it??

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my current jetting is

main- 172

slow- 40

needle-NHFS

clip pos- 3rd from top

i just put the header on and im pretty sure i have to rejet it before going run it?

ive heard it would run too lean n burn my top end?

is any of that accurate?

i have the jd kit ready...i was kind of waiting it to warm up a little because its still in the 50's and 60's here but once it warms up it will stay above 80 MOST of the time

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