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jetting questions!?

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so, i've got an 01 xr 250 it's uncorked and has a billet exhaust tip it right now has a 140 main jet but i dont know the idle jet. i will be riding at around 7000ft. i right now only right at 3000 and lower. whjat should i rejet my carb. to? i also want to rejet my idle jet to a bigger one so what would be the ideal jet to go to????


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