Might be worth mentioning I did try rebuilding the nikki carb, the needle and float were entirely messed up and it was more than just getting the aftermarket one
Did you have same symptoms with the Nikki carb before you tried to rebuild it? If so, look for a problem independent of the carb, like a clogged air filter, bad sparkplug (check gap and overall condition), old gas or water in gas tank, debris in the gas tank that is partially blocking the outlet, clogged fuel filter or the wrong fuel filter. If the engine does not have a fuel pump, make sure you have a fuel filter for a gravity fed fuel system. Systems with fuel pumps have higher line pressure and can push fuel through finer filter material. Gravity fed systems will not get enough fuel if the filter is too fine. Of course, a defective Chinese carb must be considered as a possibility. Will say that I have not personally had a bad one, but my sample size is only around 15. Finally, have you checked the valve clearances?
