Being half a world away it's not easy, If possible use the orig. carb. your local small engine repair shops goes thru kits by the gross and these kits contain extra parts that are not used or necessary many times as the kits are for a number of different Walbro carbs so there are always leftovers. Usually these are kept around for occasional use? Worth a try. I try and not to make changes if things are working.............you can find cheap Walbro clones on ebay, I just put one on a Zenoah G-26 that some one had
messed with the carb and screwed up, bent throttle arms and no telling what else. $16,00 including postage for one of these carbs, and the engine runs flawlessly! I bought the engine for $40.00 at a swap meet! Not sure what I will put it on but never could pass a bargain on an engine.