05-11-2017, 10:51 AM
The trouble with SU carbs is that they will run tolerably well when the setting is miles out, and because of different degrees of wear and minor differences, what works well with one may not be so good an another. I have three Austins with SUs and they all have different needles, all do what they are supposed to. My advice is unless you really know what you are doing with these carbs is to take it to someone who does. An hour spent on a rolling road will make a huge difference.