RE: DLE 30 replacement carb
As stated before, the definitive carb is the Walbro 813. It is rumored all over the place as having an accelerator pump but I cannot see any evidence of it in the Walbro literature. The carb has no choke. it has a "32" in the venturi as the others mentioned here. It has the high speed nozzle check valve. But the one generally available everywhere has a primer bulb.
This carb, minus the primer bulb is the standard carb from the factory on the Syssa 30.
All these carbs mentioned so far, are 1/2" carbs and are either standard Zenoah G-26 carbs or sold as replacements for use on a Zenoah G-26.