The engine you have is magneto ign. The diagram you show is batt. ign. Two different systems altogether. Two ways to shut it off. Back out the idle speed screw and and use idle trim to shut the butterfly completely. If the butterfly has a small hole in it, solder it over. Check out the kill switch on the motor. you will find a wire going to it, then to ground. Put a slide switch in place of it, operated with a servo and nyrod pushrod. Keep the switch as far from the radio as practical to avoid radio interference. If you have a computer radio, you can use a switch to close the throttle completely without changing throttle trim. Hope this helps.