That is just for the american sportworks machines. I don't know what it is about their carbs but they are unique in the buggy world. I suspect it's the way the passages are ported. They start with a 114 and I have seen more than a few with a bright white tip on the plug. Again...just the American Sportworks machines the 6150's and the 7150's. Our machine with cam, UNI, and FMF if I remember right we wound up with a 146 or something. Can't remember exactly...have to look at that thread.
I should also note that we did a ton of testing with a wide band O2 sensor stuffed in the exhaust. I have a thread on that somewhere too.
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