Main Jet, Pilot jet, Fuel screw, Needle Someone please educate me. What exactly do each of these things do? I saw a thread on the EKG needles which seemed like a good idea. If the idea is to get more fuel in the motor couldn't one simply leave the needle alone and go richer on the main jet? What about the fuel screw? Couldn't one leave all the jets alone and simply turn in out more to allow more fuel?