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So I have an 04 . Has hmf s/o . Modified air box lid , foam filter, 190 main 52 pilot. Not sure of the sea level I live in Scranton Pennsylvania. Everything is stock. Needle position is in third slot. A/f screw two turns out. My issue is it’s running lean. Backfiring only decel. I just want it to run properly. So just changed main jet from 180 to 190. PLEASE help me
 

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If it's doing it on deceleration quit messing with the main jet
Either your pilot is clogged or you have an exhaust leak or the af screw is missing or has a bad O-ring because a 52 is to big.
 
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