Thanks papasmurf, I have ordered a different make.
@ Nico, sounds like you have the best possible power supply, at least in theory, but I think I'd want to use a Pazon ignition which is less sensitive. Or fit a magneto!
You mention that your Bullet is a 1999 model, did it originally have the AC headlight with Minda awitches? I have twice been caught out using this type of switch when wiring the whole system to use 12V DC, make sure the red and yellow wire into the switch cluster is not connected to anything.
A.