Everytime after I change my oil, my bike won't start. I'm using the bleeder screw like the manual says. I usually have to change the plug and then kick it until I'm real good and sweaty. The old plug is pretty black when I take it out. After I get it started that first time ( after the oil change ) it willl start the first or second kick almost everytime...it runs excellently. Does anyone know what the problem could be cause its very frustrating and makes me not want to change my oil.