Re: flush attachment
My '56 Johnson and '56 Evinrude have the same type water intake that is in your photo. Frankly, I gave up on muffs some years ago with my newer motors because I was never sure whether I was running enough, too much or too little water into the engine, or if I was overspeeding the prop. I found an 80 gallon metal watering trough at the local hardware. It has a drain plug at the bottom so I can empty the water when I'm through running the small motors, and it only stands about 24 inches high so the motors can sit on a stand and be immersed in the water. Some previous owner of my Evinrude had attached a copper tube and fitting to the water intake plate, but it had long since fouled with gunk. I like the tank because I can put fresh water in it, and put my motors through their paces under a slight load.