I seem to get a lot of fuel flow problems when the carbys are gummed up ,sometimes are easily cleaned out and other times takes more work but as we know it's easily checked by hooking up the fuel hose from the carby to tank without the needle, float and fuel bowl to see the rate of fuel flow.
The main jet / emulsion tube does get gummed up a lot ,usually takes me a few minutes to clear it out to the correct size with 20 amp fuse wire . The fuse wire most of the time won't even push through without some WD40 sprayed into the jet first ,a lot of the jets have a bigger hole before you get to the main jet and that also can be cleaned out for unrestricted flow.
I find the fuse wire with a few tiny kinks when worked through the main jet a fair amount cleans them back to standard but would be a lot quicker if you had the right jet drill even oxy tip cleaners would be quicker to clean the jet out ,when I've wanted to slightly make a jet bigger I've used oxy tip cleaners.
