It threads into the flywheel, and then a bolt is wound through the centre to push it out from the end of the crankshaft. There are a few methods of holding the flywheel in place while you do this. Whatever you do don't wedge something between the cooling fins, as they will break off!
I chose to insert a bar into the cylinder through the inlet port to stop the piston moving and therefore the crank turning. With hindsight I should have used a plastic or wooden object as there is a risk here of marking the cylinder or port.
When the flywheel is off you'll see the stator plate. This is held on with three set screws and is easily removed along with the wiring. Then you can remove the mag housing by undoing the three bolts and knocking it away with a wooden mallet.
Behind the mag housing you'll see the crankshaft in all its glory:
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