I have a 1975 50 hp johnson. It idles fine and takes throttle out of water hooked up to the muffs but when I put it in the water it just bogs when I give it throttle.(when in gear). It has 120 psi on both cylinders and I built the carbs, fuel pump, replaced spark plugs, primer bulb, gas lines(all gas line from tank all the way to the carbs, I used 3 different gas tanks. The only things I know left are the stator and the reeds. Can anyone help please the boat is just sitting.