Ah um I'll add this since I don't have the engine anymore and I cannot pull the stator off. It will be the exact same process:
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http://www.miniriders.com.au/motor-tutorials/25618-stator-replacement.html
1)Take of the sprocket cover.
2)Take of the nut that’s holding the flywheel on (1 X 14mm nut).
3)Insert the larger bit of the flywheel puller into the flywheel thread ( left hand thread) then add the bolt into the large bit (right hand thread), keep on tightening until you see it move towards you.
4)Take out the two (2) Phillips head screws, might need the impact screw driver.
5)Take out the two (2) o’rings that are placed in where the two (2) screws use to be.
6) Fit all new o’rings to the next stator and the casing.
7)Put the new stator on to engine.
8)Put the two (2) Phillips head screws in and tighten (impact screw driver).
9)Put flywheel on stator.
10)Put flywheel nut ( 1 X 14mm) on and tighten
11)Connect wirers and put in bike.