The later versions had a lighter weight gearcase than the earlier versions. In fact it was about the same as the gearcases used on the 5.5-7.5hp motors. IMO, it was not sufficient for the more powerful 10hp powerhead. Parts didn’t hold up as well, especially if water got into the gearcase. I just refurbished a 1962 model and had to replace all the gears, clutch dog, driveshaft and the lower unit case because the bushing where the driveshaft passes through to the pinion was severely scored. Good parts are getting hard to find and are expensive if you can find them.

In spite of all the probably justified bad press on the gearcase, the 1961-63 10hp is one of my favorite portable motors. It has the improved wrist pins. The 1958-up has the isolated drive shaft–a big plus, especially if used in salt water. If it isn’t abused, the gearcases hold up pretty well. But lack of maintenance is a killer—failure to change the gear oil and/or water in the oil. Evinrudes are better than Johnsons because they have tighter-fitting hoods. Looks are a matter of opinion.

Everyone has pointed out all the ‘issues’ with these motors in the previous posts. That said, I too am still very fond of these motors. It is imperative that the gearcase be maintained on these and water is a killer for them. As long as you find one in good shape and keep it that way, it will serve you well. I have a 59 Evinrude Sportwin, and 59 & 61 QDs. They are all excellent runners and function beautifully. I also have a second 59 Evinrude Sportwin in the queue for mechanical rehab. Not sure of the condition of that one internally yet, but here’s hoping it’s good. These engines are quite powerful and very reliable and they will idle like nobody’s business. If they are in good condition and reasonably priced, I’d definitely go for them. I love the way the 10hp OMC engines run.
-Ben