I'm running 12g total, 3x4g
With the weakest scooter contra I could find.
Puts my rpm at full throttle around 10.5k, I can crack the throttle to maintain about 8.5k for cruising once at speed.
Running a mildly ported dr kit, with transfer bases opened up full size, and matched to cases, all the boost bridges removed inside the boost port to be one big port, a V reed block with a 24mm carb.
It's amazing what most standard kits can do if you get rid of all their bottlenecks with barely touching the ports at all.