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jetting specs for my '04 honda crf 250x

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i have a '04 honda crf 250x. i am going to buy a pro circuit t-4 slip on pipe.

what would be a good spot to jet my bike. pro circuit recommends a 158 main jet, and a 42 pilot jet. i was wondering if there is any pros or cons with this set up. i have also taken the smog off of the bike. any thoughts and or recommendations would be appreciated

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