Sometimes you can attach the exhaust y-pipe back on the cylinder and use it as a lever to rock the cylinder a bit.
Or, get the piston down to bottom dead center and stuff a heavy rag on top of the piston and part of it sticking into one of the ports....then turn the crank hard.
Or, fill the cylinder with rags and install the cylinder head with a couple nuts to hold it. Turn the crank hard to bring piston up to lift the cylinder free. You may have to install the drive clutch to get enough leverage to turn the crank hard to bring the piston upwards. Enough tries it will eventually start to wiggle free.