Reply To: Martin 40 Restoration

[frankr]

The thin brass tube going down through the center of the carb from the top is the idle tube. All of the idle fuel comes up through that tube, which has very small passages which get clogged easily. So make sure it is squeaky clean. Also, the slow speed mixture needle on that carb works backward from what you would normally expect. Screwing it “in” makes it richer.