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When you jump start on the solenoid or diretly to starter motor it starts and runs and idles normal? If your answer is yes probably you have a problem at the kill switch/starter button combo or its wiring/plug behind the headlight. There is a tiny metal thing touching to a brass contact when you turn off kill switch which is corroding and making problems. I dont think you ECU or wiring is bad if your bike is running with the jump start. Please make sure your starter switch works.