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Although it's Spring time now, I did this work a few months ago. This is still the parts motor I bought in the Fall and my first attempt at removing a cylinder with a stuck piston. Oddly, on the right side of the engine the piston was free but the majority of the abuse and corrosion on this engine is on the right side. The inside of the cylinders are clean with no damage or chips in the chrome lining. I started with a couple of different cans of penetrating oil, a wooden dowel, rubber mallet, and a lot of patience. No joy. I decided to drop the lower case and see if that helped somehow. That really just made the management of the pieces more trouble. The top portion of the piston with the rings was visible through the exhaust port but nothing I did would move it up or down in the cylinder. Eventually I came up with the scheme you can see in the first picture. I was able to get the cylinder up and put some steel spacers between the cylinder and the top case. I used a large heavy-duty puller and mounted two of the three legs diagonally on the cylinder. I usually use this puller, from Tusk, to split crankcases and remove crank covers. I was able to thread the center bolt down on to the piston and using a larger ratchet and more oil, I eventually pushed the piston down the cylinder until it was resting on the crankcase top. Although it didn't push the piston out of the cylinder, it pushed it down far enough to get to the wrist pin. I rigged up a homemade puller and with long 8mm bolts/nuts, multiple washers and a socket that allowed me to pull the pin far enough out of the connecting rod, I got the cylinder and piston off. Once the cylinder was off I was able to set the cylinder on some wooden blocks and push the piston the remaining way out of the cylinder with more oil, the wooden dowel and a rubber mallet. If you look at the second picture, the piston on the left was the one stuck and you can see a dimple on the top from the threaded bolt pushing it down. The rings are deeply seated and stuck in the landings. The other piston is the right side piston after I cleaned it up. I'm still surprised that the inside of the cylinders are undamaged. Not sure I'm looking to dismantle a stuck motor again anytime soon, but it does teach you a lot.
... can't just go down to the scrap yard and get another one .