Yep, that's my Yak Only took me 4 years to get around to finishing it. A whole lot of interruptions

Regarding that ignition. If you only get one spark, and only when the ignition is turned on, there's a good possibility that the hall sensor is out.

Next previous question;

No you do not have to have a kill switch and yes you can kill the engine just like you do your glow engines. You only need to set up your throttle linkage correctly and set up the end points of the throttle servo correctly. Many newcomers to gas engines are convinced that a separate kill switch is absolutely mandatory for safety reasons. For some reason they think a gas engine is more dangerous than a big glow engine, but they don't use a kill switch on a big glow engine. Go figure.