Kill button prob.

OK. This seems like a no brainer.But I'm kinda lost.My bike ran fine.I switched handlebars.Thought everything was ok.I'm on the track and see that my bike is dying.I immediately suspect killswitch.I wiggle it and it's fine.But won't kill the engine now. I wiggle it on the bar again(not pushing the button) and it kills the engine.To avoid the engine dieing right before a huge jump I go back to the pits and take the kill button apart.I inspect it and figure the new renthal bars have paint on them and not letting it get proper contact to kill the engine.I scrape all paint off with channel locks and sand paper. I can't get the thing to work now.The bike will run but won't stop.I checked the connection near the tank and it is plugged in.I'm lost.I think it would be a coincidence that I changed bars and the button went bad.What am I overlooking? Do I buy a new killbutton? Or switch the bars back to see if it works? Thanks.