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Jetting the 2006 250F (bog, choppy idle)

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I am trying to jet my new 2006 crf250. When i got it, it bogged really bad and didn't run that great (backfiring...) I richened it up a bit and ran better and better.

I am now at a 58 pilot and a 178 main. Has stock leak jet. I did the A/P mod and that helped. I am still am experiencing a bog and now the idle is really choppy.

I have read on this site and most people are using around a 42/45 pilot. I am at about 2500 ft. Just kinda want to get the bog outta there and have a smooth idle but i am wondering why it takes such a big pilot. The bike is completely stock.

Any ideas???

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