like the title says this motor is killin me, I have checked compression, switched coils, changed plugs, checked timing, checked the reeds and reed cage, and cleaned the carbs countless times.......the top and middle cylinder are burning fine but the bottom cylinder is not right, I can take it out and the motor idles fine and spins up great in neutral but as soon as u put it under a load it falls on its face.... with the cowling off I can see all 3 carbs dumping plenty of feul but after I run the motor and pull the plugs the bottom cylinder plug is white as snow and looks almost brand new.....does anyone have any idea cause im obviously looking over something that has got to be starring me in the face......