It could be the impulse hose, or even the carb boot
If your talkin about the other two wires that come off the coil, they only earth out the coil il to stop it sparking, if you wanna check them just take off the wire from the coil that has a spade conector and isolate it, ps maybe worth cleaning any oily saw dust from around the spade conector. But you may have done this already
Edit, if you start it without the wires conected to the coil,, you will have to use the choke to stall the engine or use the decomp valve.