I JUST DID A COMPLETE REBUILD OF A 15 HORSE 1981 JOHNSON , WAS WONDERING HOW TO TEST WITHOUT TAKING TO RIVER? I HAVE A WATER BARREL 55 GALLON DRUM BUT CANT REALLY TEST OVER IDLE, TO MUCH WATER LOSS , CAN I REMOVE PROPELLER TO RUN FASTER OR NOT, I AM THINKING IT NEEDS PRESSURE OR IT MIGHT FLY...