on the standard magneto plates (rupp too) it is unregulated ac voltage, each coil powers a light, head and tail. the coils are not connected, one lead to each of the connector pins. the other end of the winding its grounded. when i tied the coils together last year i dont remember the arrangement, it wasnt inner to outer for sure, but i had low output, id prefer to increase voltage.
those regulators you are referring to are good units, saw many of them on small tractors and mowers, usually the stators died before the regs did.
i have a handful of the motorcycle regs im gonna post up for sale soon
on another note i looked at a honda motorcycle stator it had 4 poles wound out of 12. each coil was wound just like this 3 pole tecumseh inner to outer with the first one wound passing off to other in the same direction as the flywheel