I'm trying to fix a bike for a guy who has a CNS carburetor. The bike will idle, rather poorly, and will rev up with no load, but when I try to actually ride it, it bogs down horribly and I can go about 6 mph on level ground at WOT. I have tried every adjustment combination I can think of, all the spots for the needle clip, messed with the idle speed and air screws, changed the float level, nothing I do makes any difference, except for making the bike not run with some adjustment combinations, or making it idle really fast. No matter what it still bogs down and dies under any sort of load. Anyone got any ideas?