In my quest for a better throttle, I had to go elsewhere for a kill switch. My old Honda MC had a little button that grounded to the handlebars, I only used it to backfire.
ATV's [ quads, four wheelers, utility bikes], call em what you want, have excellent kill buttons, get the 2 wire type, one to blue, other to engine ground. Use a VOM or powered test light to test switch before installation. Once switch is ' known good '
your good.