I have any number of things I use cleaning up motors. It depends on what your trying to remove. A guy I met, who is also into these, told me about the copper cylinder paint. Hard starting and no power may indicate low compression. Try it out of the water and see if it speeds up. Your carb number comes up as being for a homelite product from 1946-47. Take another look at the number. There is a video link to mine running . Does your carb look like mine? I feel this carb is too big for the size of the power head IMO. This motor, while cool, is just a collection of parts used on other motors. Its a guesstimate on my part that there may only be 100 remaining, not a fact. Video Link. – https://youtu.be/XPXjFZcMOl8
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.
