Were the coils complete with wires & boots?
& thats grounded good to frame
b/y or b/w wire on cdi, isnt shorted to ground?
What do you have on r/b on cdi?
iirc one of these bosses, has a flat vertical guide pressed in it, that sticks inside the slide bore. that rides in the slide slot, to keep it from spinning. Sent from my SM-A505U using Tapatalk
"from a cut line underneath that goes to the atmosphere"
Over flow line?
Sounds like one carb is flooding and one is not getting fuel.
I'd id go through the carbs again. make sure slides arent sticking, fuel fills both carbs & fuel shuts off, when floats rise it spec hight & go from there.