My bike had a 175 main jet I'm it and it ran good.not sure of the slow air jet.I purchased a Dynojet thunderslide kit and followed directions and bike wouldn't take the change it was bogging down like to much fuel. So now I have the 175 jet back and left the thunderslide in it. I also played around with carb and don't know how it was set before. It doesn't have power like it did. What jets are best for stock carb. I have dynatek coil, Vance Hines pipes and k&n filter, mad wires and e3 plugs.