Thermostat housing is in the "head" of the motor. The head is the part on the powerhead that is farthest to the back. It is where the spark plugs are. Look there for some type of bulge, or place where there are bolts that don't go around the "head". If ya can't find it, write back, we'll find it eventually


Also, the thermostat, when you get to it, will look kinda like Saturn, or something to that effect, if you don't know what you are looking for. Good luck, let us know how it goes.