07 kx 250f

its hard to start and stalls off idle at low rpm once in a while,this is my brothers bike the bike shop he deals with jetted it rich to help it run cooler.but the real problem was the head gasket now thats fixed.i want to jet it back to normal or better. any ideas?we usually ride between 3000-6000 feet.i was thinking about going 1 leaner on the needle and 1 size smaller on the pilot to start?

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