What most of you all seem to have forgotten, or (more than likely) just plain didn't/don't know, is most of the cube type carbs have one or more non-replaceable check valves in em. When they go bad all the rebuild/G&D kits in the world ain't gonna help, nor will tweekin any screws.
" But let me tell you something ,folks: You can't fix stupid!
There's not a pill you can take, there's not a class you can go to. Stupid is forever!"