The key switch has two functions: OFF= 9 and 20 connected to short out the ignition, ON= 11 and 15 connected to power the estart button.
Do not ground 38 (from the CDI). It is actually 20 (38>21>20) when you follow the path. Your wiring diagram shows 21 also connecting to 22. I believe if you follow this wire, it will go to your kill switch.
Do you have a full size image of the wiring diagram? This would help me follow along.
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2011 EC250E
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