You can also hook up a choke servo with a linkage rod. Then configure your TX and put that choke servo on a switch, such as the landing gear switch. Then when your ready to start the engine, just flick the switch and turn the prop through a few times to prime the engine. Flip the switch off and then your ready to run.

If you need to shut down the engine--in an emergency--just flip the choke switch on and it will choke out the engine and kill it in about 1 second.

Then you've got 2 ways to kill your engine from the TX. One way is to pull the throttle stick and throttle trim all the way back. You should set it up so that this will definetly kill the engine. If that servo fails, or won't kill it for some reason--then you flip the choke switch and kill it. If that don't work, start yelling to let other flyers know you have a problem---- and try to plant it out in the grass--away from the flight line and pits. Better to kill a plane than a person.

Another way to do it is to buy a Grwat Planes kill switch. It's a microswitch. You just wire it in the positive + lead on the battery switch for the electronic igniiton system. Then use a small servo and a nyrod to push the switch off when you need it. Configure the TX and put that servo on a switch just like the choke servo. Set it up so that if you flip the switch--the servo pushes the nyrod and pushes the micro switch to a closed position. That kills power between the battery and ignition switch. Dead engine.

Another way to do it is buy a fiber optic kill switch that relies on the RX battery to maintain power. As long as you have RX power--the kill switch keeps the ignition circuit operational. If you loose the RX battery, the kill switch cuts power to the ignition system-- engine automatically goes dead. The fiber optic switch is designed to keep the ignition system ON as long as the switch has power. If the switch looses power--it shuts down the circuit and therby kills the engine. Kind of expensive--but easy to install. Plug and play.