Would like to hear opinion on how to kill the engine ....
Do you used the ground wire to kill the engine or adjust the throttle end point to shut off fuel to the carburetor ?

Most take the idle screw out and kill the engine using the radio. Also.......I use the Killer B kill switch on my boats. If you loose radio or reciever battery it will kill the motor and you can also use the third channel on your radio to kill the boat. Best kill switch on the market in my book.

Yeah +100 on the killer bee switch!!!! Have one in the boat and one in the baja. I also have the boat carb set up to be killed when you hit the brake on the Tx.