Hi Jared,
The whole point of that test was to prove the issue was the carby or the fuel supply to the carby. Cleaning these things does not always solve the problem but at least you now know what the problem is.
This might solve the problem check it out first but I think this is the one you need.
https://www.ebay.com.au/itm/12HP-Ca...-491031-490499-Engine-Part/132865316111?