I will have to purchase the tapping tools, which costs money, which I will have to find before I can work on them.
But for now I will clean the pickup tube as you said and then I will count how many turns it takes for the mixture screw to bottom out and then clean it and the holes inside. Lastly I will check the surface of the bottom of the carb and surface of the top of the tank for flatness. I will post the results when I have completed it.
