I have a 2000 Dyna Low rider with a fairly new HSR42 Mikuni carb. Its got a Vance and Hines Python exhaust and the old S&S super air cleaner. My issue is when its warmed up I often get popping in the exhaust during deceleration. Also trying to set the mixture I noticed I can back out the screw all the way and it doesn´t seem to falter. It has the stock jets installed still so I am assuming the jets need to be changed to accommodate the air flow. Any suggestions would be much appreciated.