Even if it sat for 15 years, I'm guessing the engine probably wasn't perfect when it was parked.
You'd probably want a full rebuild even if it did turn over.
The good news is that these engines are small, slow, have very forgiving tolerances, and are relatively cheap to rebuild.
If you're not an experienced engine rebuilder, this is a perfect first engine. If you do have experience, you'll enjoy how simple this one is.
If it were me, I'd try (for no more than a week) to get the pistons freed. Even if you pull them out frozen with the sleeves, you still have to get the piston out of the sleeve. Just easier if everything's loose to begin with. But really not a big deal if it doesn't work, or if you're in a rush.
Either way, pull the head, send it to the machine shop for glass beading and a valve job, might have them knurl the valve guides while you're at it.
With the head off, you'll see just how bad half the cylinders are.
Drain and pull the oil pan so you can see the bottom half.
The cylinders will be rusty - but if they're not crusty with flaking rust, soak them with atf/acetone. Every now and then, smack them with a heavy hammer using a block of wood to protect the pistons.
You should know soon enough if it's going to move. Give it a few days of soaking, if nothing - just pull the sleeves/pistons/connecting rods as they are, and come back here for a discussion on getting the pistons out.
15 years of rust probably isn't going to hurt your transmission. I wouldn't worry too much about that.
Just keep reminding yourself that these are more like tanks than Ferraris.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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