Heat the Stator case up with a heat gun real good (in that shaft area). Then tap/hit the cover down on a solid surface. Often the shaft and bearing will "fall out", and you will then see the screw on the end.
More info. here:
http://www.gasgasrider.org/forum/showthread.php?t=24995
Jeff
PS - Heating should work! - but if it doesn't, let us know. Some have made tools to pull the thing, but if it's really stuck I'd consider what I believe is MotoCenter's method. It sounds invasive, but isn't really that bad. Drill a hole through stator case where the shaft sits, then put a punch through the hole and tap out the shaft. When you're done, put a drop of JB weld in the hole, and you're back in business. Wish I could remember the thread where I saw this done.