Lucas Model 450 fitted to KYL95.
Apparently there's supposed to be a later Lucas model MC45L. It must be an improvement.
So the question is ... what to do about it? Fashion brush holders for the bottom to increase output and balance the load on the armature, or try to get a different dynamo plate or different dynamo / alternator altogether? Shame I just spent the cash on a solid state regulator, if I would have known that I'd have so much trouble with it, I'd have been more inclined to covert to 12 volts.
First step will be new brushes. I'll bodge a set if I have to just to see I can get less voltage drop across the brushes and charge better.