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No air box lid

718 views 6 replies 2 participants last post by  Memosrt4 
#1 ·
I have a 2012 yfz450 fmf power bomb header and big gun exhaust and it’s backfires A Lot on decel I am wondering if this could be from having no lid on the air box? Thanks
 
#4 ·
I’m running a 165 main 47.5 pilot and I have ordered a 170, 175, and 180 main jets to try out I also ordered a 50 pilot to see if it helps at all

with the jets I have in it now I turned the a/f screw out 4 turns (I know it’s a lot) just to see and it made a noticeable difference on the backfires
 
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