I don’t know Mark. I’ve saved ’em worse than this one looks. I wouldn’t give up on it yet. Here is the inside of an FD-10 I got back in November at a local auction. This one was stuck pretty bad.

After plenty of scraping, soaking, tapping, sanding, cleaning, and tuning here it is now.

https://youtu.be/KewD3l0gDso

I’ll run it some this season and see how it hangs in there. It has a lot of time on it. Everything it has left to give is all gravy at this point. It was in really bad shape. It did have good ignition components in it when I bought it for 5 bucks at the auction though. I say keep trying.
-Ben

https://www.ebay.com/itm/Johnson-Evinru … nz&vxp=mtr

Here is a good powerhead. It would be worth buying a good used one. Save time and money.

Tear it down and see what you get inside. Magic elixirs can’t fix rust. If there’s any rust on the crank bearings, even if you do free it up, it’ll die a catastrophic death in short order. By tearing it down, you’ll know if the guts are good beyond the rusty cylinder walls. You’ll have better access to tap the pistons out with a wooden dowel. A light honing, freeing up the rings and reassembly may be all it needs, and you’ll know better that it’ll stay together.

Yeah, if it really is a nice, clean, good looking engine, sure is worth a little extra effort/disassembly….