In the pic it looks like a airbleed carb, To richin it up you have to screw the screw in to lean it you take it out. Try setting the high end 2 1/2 turns out and the low end screw it in and back it out 1 turn, Airbleed low end does not adjust how much fuel is going in it adjusts how much air is getting into the mix. With the engine set like this it should be blubbering rich so keep the glow driver on for now, try and get it to full throttle and lean out the high end to max RPM like JimTrainor suggests then go to a lower idle and it should start to blubber a bit, lean it 1/16 a turn counter clockwise and then idle up slowly. It will most likely load up and might stall but might not with glow started still on. Keep doing this until you get a smooth transition but you will have to reset the high end like you did at first every 3-4 low end adjustments. Once you you get a good idle and transition reset the high end and you should be good to go.

Dauntae