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Jetting help???

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My buddy just put a Dr. D carbon pipe on his '06 YZ450F. It is now backfiring and shooting flames at low rpm's like a champ. We live in Phoenix so average altitude and hot dry temps. All MX...any suggestions would be great, and yes he is going to join TT. :thumbsup:

Thanks!!!

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Though I agree he should go up on the pilot jet size, has he ever adjusted the fuel screw? Go "out" in 1/4 turn increments.

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