Join Date: Jul 2006
Location: Northfield, Illinois
Yes, MUCH does depend on the Webers. Uneven readings with a >not-just-rebuilt< but KNOWN sound engine (tested) indicates either air leaks, or poorly closing butterfly plates, worn butterfly bars, seals bearings, bent or twisted bars, or combinations of the above. Most often combinations of worn or unsealing plates and damaged or worn bars. Most Weber DIY builders do not understand how to disassemble and reassemble these components correctly, resulting in issues of air leaks, and in some cases, damaged throttle bores from poorly set plate wear.
With vacuum readings from a manometer, you must KNOW that each lead reads the same, with the same vacuum. You must KNOW that each cylinder is pulling the same air volume. You MUST know Weber build is 100% correct. You must KNOW there are no air leaks.
Given that knowledge, it's very easy to pinpoint the problem area.
I hope this is helpful.
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