I know that a carb can be made to flow enough fuel because
we convert gas carbs to run methanol in our Giant Scale race planes..Mostly Zenoah GT80s, although the same thing works for all carbs..We drill out the inlet needle hole to .083...The 3 small holes in the venturi under the welch plug are drilled out to twice the area, and the high and low needle holes are drilled out larger, just enough so that the taper on the needle still closes off the holes when screwed all the way in..If the needle doesn't have a constant taper it can be ground just enough to make it right...ANY carb can be modified this way, and if it will flow twice as much methanol as gas it will surely get rich enough with gas, probably way too much to even work....The WT499 just happens to be calibrated to work either way....Some carbs might have too small a hole in the brass high speed nozzle, but not likely...
A WJ64 carb from a GT80 modified this way flows enough methanol to let the engine run 11,500 rpm with a 19x18 race prop....
I have not tried it, but a WT76A from a 3.2 Sachs should be enough carb for ANY 50cc engine....It works very well on a G62..[8D]