Sounds very much like a connection issue. If you've gone through all the wiring connections, then it's time to clean all the ground paths. This means stator to engine, engine to frame, and yellow/green ground wire connections to the frame.
It could be a bad solder joint on the stator connections (yellow wire), or corrosion on the stator itself. Time to get a flywheel puller.
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2011 EC250E
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