Here are afew tips that may help Mikael
Remove the spacer on the drive shaft before you remove the engine from the frame and also the carb.
Like Bruce said, you have to twist the engine inside the frame. Sometime I have the engine inside the frame and then turn it verticallly with the cylinder head down and then twist it counter clockwise until I can get the drive shaft free of the frame and the engine.
Once you get the engine out put it on a bench with the shaft up. Remove the plastic flywheel cover. You can remove the flywheel without a puller by hitting the edge of the flywheel with a RUBBER hammer or mallet to dislodge it a bit. DO NOT use a metal hammer! Then wearing heavy work gloves grip the flywheel on each side and wiggle it up the shaft. It is has strong magnetic field so it is a little bit difficult to get it up the shaft. Be sure and wear gloves because the flywheel fins are very sharp.