On keyless e start bikes ,they require a input from the stator to the cdi to excite /turn on cdi.This turns off everything when you turn bike off and it senses crankshaft not turning .This is to save battery etc.This is why your headlight remains on and turns off after a few seconds .
This input goes to pins 5 and 6 on cdi plug ,Red black, Blue wire sharing a 4 pin plug with wires from ignition pick up .
The CDI rarely fails but stator does .Not sure of voltage but there is a resistance measurement (I think about 12 ohms)
It would be like motor turning over with the ignition key off.
This is taken off wiring Diagram from my 2021 Reiju MR 300 which is the same as a 2019 e300 which is prob the same as yours
Good luck
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