How do you shut down a magneto powered engine?

To shut down a magneto-powered engine, first, reduce the throttle to idle to prevent engine over-speed. Then, turn off the ignition switch or switch the magneto to the "off" position, which cuts power to the spark plugs. If necessary, you can also pull the mixture control to the "idle cutoff" position to ensure the engine stops completely. Finally, ensure that the aircraft is secure and perform any post-shutdown checks as needed.