You should be able to find the resistance readings for the stator coils. Check them with your multi meter and ensure they are in range.
Pull the stator cover and flywheel and physically inspect the coils.
If you need to replace the OEM ones are silly expensive. Ktm sells the same stator for a fraction of the price.. but you then need to splice the loom (it's not plug and play).
All the info you need is in this thread:
http://www.gasgasrider.org/forum/sho...ghlight=stator