1200RC

Good question, & if i come up with an answer, i will let everyone know, but there must be a way of "sizing" carbs. I wonder if some of the carb manufacturers have websites with the means to answer these questions?

My GX is strictly street & it is currently about .140" oversize [76.5mm] but it's now worn out again, so i will hit it at 77mm.
I keep the revs down a bit so that it will live long enough for me to be able to drive it home & i'm too old to be a highway hero anymore. My cam is of an unremembered grind, but it was described as a "light sports profile" & my engine idles quite ok at about 900rpm. It pulls smoothly from down low & this is also a benefit of the variable venturi carb design [SU's]
I also got more than 50mpg one day when i drove for economy when i went to Holbrook for the Ultralight Fly In weekend.

I also managed an AVERAGE speed of just over 70mph while turning 42mpg [screw metrics] late one night between Albury & Bendigo. I figured that i had to be happy with that.
If i were to go seriously racing i would do some things diferently, but i can't afford it, so i tailor everything for maximum street pleasure & that doesn't impress the wankers. Not my problem.
Chris