How does the ignition advance work?

[Disorderlypunk]

and i thought i was bad with looking over wiring diagrams
i spent an afternoon with a A3 photocopy of a gs1100 wiring diagram and a bottle of tipex deciding what i did and didnt really need to give myself a
chop wiring diagram lol - it looked wierd as i was doing it in a pub but thank god it was a bikers pub so not the wierdest thing thats happened i there.