Thanks for the reply ... the reason for the question is due to the acquisition of a Two Brothers exhaust system - you can't change one thing without adjusting the other end of fuel delivery. Keihin has at least 4 specific model designations / designs for their carbs. The size doesn't refer to the model type.
Kymco is no help in this issue, treating it something like a bizarre trade secret. Which seems to refer also to the lack of digital service manuals and even a parts catalogue. This will be done after the variator, rollers and clutch are completed over winter. I got ahead of myself as the price for the exhaust system was down right silly and it was a one time deal ... so it will sit until the rest of the S8 is completed. If I find the model designation, I'll post it here.
Dion