I understand the basics of how a carb functions but I've always been unclear about the vacuum lines. Can anyone give me a 101 on what each of the vacuum pipes do/how it works.
As I understand it, as the engine gets faster, the vacuum created at the manifold *ahem* sucks harder and so it adjusts the carb's fast idle. Is the ferrule at the right side of the carb, the one that connects to the dizzy, similar? I assume it's vacuum is created elsewhere, and if not wonder why both lines don't go to the manifold.
And also, whats the difference between the idle screw at the bottom of the carb, and the one on the side?