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. Other thoughts: 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...). HTH, Hendrik
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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