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Re: The old A has it in for me
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You said: "It seems like a good flow.".
How did you observe that? I'd remove the drain plug from the carb bowl and collect the gas in a container. Measure the amount after letting the gas flow for 15 minutes; should be at least a gallon. That amount may be regarded as "being available" to the jets. So, if the flow from the drain plug from the carb bowl is sufficient, the problem of lean running could be in the jets.
1) Is the venturi mounted properly?
2) Is there sufficient vacuum? Remove the pipe plug from the manifold (just above the flange to which the carb mounts) and screw a barb fitting in. Attach a transparent U-tube and fill with water. I must confess that I do not know how much vacuum it should register, but you could take this measurement form your B (or others may chime in...).
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