Bashplate,
I've just found this forum and Interested in how you got on with the carb, I've just bought one of these for my 200 Hi boy.
You said it ran well at low RPM, what size pilot do you have in it? mine came with #15
Main is a #95, did the 97.5 main make any difference?
Like you I find it hard not to think in terms of the Keihins I'm used to. (which is why 15 sounds so small!)
cheers
Nick