It occurs to me that some of my methods might seem peculiar, but with customers living 40 to 60 miles from the shop, I often have to fix things over the phone. I try to use easily understandable fixes that can be remembered for future problems, and always try to recommend troubleshooting methods and fixes that can be easily reversed if they fail to address the problem.
I rarely replace jets or solder and drill them now. Instead, I have a dead mag coil that I unwind some very thin copper wire from and tie a piece to the jet tube of the carb and run it down the tube thru the float and then stick the end into the main jet to see how it runs, still too rich? add one more wire, and more if needed.
If porting or high-flow muffler is later added, then wires come out to re-tune the carb.
I know these methods are not common (or maybe not even best for a hobbyist) but they work for me and save my customers some long rides to the shop.