Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
If you send the switch to me and pay for the return postage I'll refurbish it for you. Send both switches and I'll refurb both. I won't charge a fellow 400four owner.
It is just the switch different, Honda used the same loom for all the markets. Lots of imported US bikes here in UK have had this done. There may be a slight difference in starter butten/solenoid wireing but nothing majour and very easy to do.
Worth looking into postage, though these days I'm sure it ain't cheap
I didn't notice you live on the left side of the pond.
Geologically, it's about the same age as old England.
Black wires are switched power wires on Honda's I.E. live when ignition switch is turned on.