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Sailorman, a couple people have mentioned the possibility of making your Yammy 50 run right. Is that something you are open to? Because I think a 50 hp works for what you want right now, and if the engine is clean & you trust it I think it is worth exploring.

A lot of things come into play, like bottom paint, engine height & prop. But I will bet you that doing a proper de-carb on that engine will put a smile on your face. I see this all the time when someone buys a nice clean old boat, the engine runs rough or doesn't perform, etc. Well the very fact that these old boats haven't been used is why the engines don't run right. Engines like to run and every time you randomly run them just means another layer of varnish builds up.

Putting a bottle of magic into the gas tank isn't a proper de-carb, it is a specific procedure to remove the build up. The additive you use needs time to work so you have to allow it to. Initially you will blow a mound of gunk out of the engine, but you aren't done and have to cycle that solvent rich fuel mixture through the engine many times and let it sit.

If you like how the engine runs a new prop is a good investment.