Side note I've been and still am an outboard mechanic for 45 years. Because of the price of a new engines that is pretty much out of the question for an old boat. I would look at used engines with good compression and a good gear-case. The easiest option is the same brand that is on it now ( The controls, propeller, etc will be a direct fit). Any brand ( Except Force because of parts availability) is a good choice. In my opinion price is the biggest factor. The fuel/oil delivery is the biggest killer of an outboard. 80% of the repairs I preform are fuel/oil. Also if you go with an older Johnson/Evenrude or Mercury 2-stroke I would remove the auto oiling and pre mix the fuel, Yamaha I would leave the auto oiling in tact
