This bike has been a bear to keep a plug in. It needs to be short shifted to perform well so I am always in the bottom of the power range. I have tried many things to get this bike to clean up off of the bottom. I tried a 45 pilot, leaned out the needle, made sure the ignition was correct, and changed reeds. My last effort was to use a B7es plug, a bit hotter than recommened. The bore is good and the bottom end is new. Does anyone know of a way to get this bike to clean up off the bottom?