no need for water cooling head, there is airducts in the top that permit more then enough air flow for the head

you dont always need a water cooling head, the main reason is because the water is right there and the tops of most hulls are pretty low, but mine is a catamarna so a stock cooling head would have 2 ducts on each side feeding it air off of the lake or pond, which is cooler air then on ground.

here are some pics with the axial in the boat ( i didnt even have to cut the crank on this one to get the coupler to work, it was easy