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Well I had to throw everything at this one. First I filled the cylinders up with WD40 for a couple days. Nothing moving. Soaked for another week. Nothing. Then I tried liquid wrench for a couple days. Nothing. Then I tried some evapo rust. That stuff does a number on rust but still no movement. So I took it to work and preheated the oven to 350 degrees and put the power head in for about a half hour, then moved it to our walk in freezer. Then soaked it overnight in WD40. Next day put the flywheel on and using a strap I had a friend put as much pressure on it as possible. I took a wooden dowel and put it in the spark plug hole and with some heat gave it a whack. Pop, the top piston came free. Have been soaking the bottom piston and tomorrow will try the heat , freeze method again