A neighbour, an Electronics Engineer, is attempting to get the '3-brush' dynamo to work. I supplied the wiring diagram from this site

There isn't a speedometer - so it now has an electronic thing for a bicycle and the oil pressure gauge isn't connected (to what?). The silencer appears to be a 'special', modified to clear the stand.
A fine little bike with potential.
A couple more pics to follow.
Bob.