Everything has been cleaned new spark. The compression is good enough for it to start. It just won’t stay running. Adjusted the floats, new spark plug. You need to rev it out high to keep it running otherwise it will die.
ALL of what Awk said !! You have to take carb completely apart, you have to be able to see through the Jets. Pull main jet holder/emulsion tube and clean. It comes up through slide bore after removing main jet, washer, and slosh baffle.