I seem to remember a cotter pin that must be removed from a lever that advances the magneto when the throttle is raised.
Next there are two clamps under the stator plate. You will see some nurled nuts on each side that tension the fingers of the clamp. Loose these and pull the metal piece out about 1/2".
Remember that because of the neutral cable that the throttle must be in a certail place (above 1/2 throttle I think) so the stator plate can be lifted off.