Tamean's wiring diagram looks pretty much like mine ('00 200).
I'm kinda under the weather this morning, but I'm confused, too.
Stu,
You mention 4 wires to the 'ignition coil'. Although the 250 may indeed be different, I don't know why there would be 4 wires there at all. Which makes me wonder if by 'ignition coil' you are referring to the magneto? Under the LH cover? There are two coils in there, one for lights, one for spark.
There should only be two wire connections to the ignition coil, the third going to the plug. This IS a CDI unit, isn't it? That's where the kill switch wiring would go (as the diagram indicates)