I just put my HMF S/O on, and I changed to a 125 jet. it still sputters a bit right on top, I turned the air/fuel screw 2.5 out then went some more and it helped some, but how much can I screw it out before changing the jet size again?
go up to a 135 - 140 main jet if you leave the air box on.
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Honda TRX 450R
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