Dishsoap, unde load engines run leaner than without load. The engine screaming when at full throttle over jumps is a classic sign of being to lean, it's commonly refered to as running on. If you are seeing good smoke in the infield and a normal operating temperature then this would tell me that you are running a rich bottom and are too lean on top. Please go back and tune via my tuning guide and most importantly pay atention tonsetting the air gap first and then adjusting the idle with the LS. If you do this then it is impossible to have a rich or lean bottom.

You sealed the carb neck (which is not needed as we run 2 o ring on our carb) but this virtualy eliminates and chance of an air leak. So the only way a novarossi carb will make a difference is if you are way out of wack on this one and you are not when you put on the novarossi one initialy.