ORIGINAL: gkamysz
The CH 1/4-32 plug boots have not come loose in my use. What kind of battery are you using? Are you using an electronic ignition kill switch? It's rare to see an intermittent hall sensor. They either work or they don't. Unfortunately, I don't know about the self sparking.
6 volt supply, as specified on the outside of the ignition box. No kill switch. To stop the engine, I just unplug the battery.