I think he is referring to the CDI unit since I also faced the backfiring issue in my 2012 super power 70. When the mechanic checked it, the clip which connects CDI was loose and it was causing missing and backfires, so that's what he is referring to if it doesn't fix after readjusting the clip, replacing the whole CDI unit is the solution. That's the switch-type thing he is referring to in this thread.