Look at the parts diagram Wayne posted. # 27 is the idle metering jet and sounds like what you describe. It screws in the bottom casting and has a slot for a screwdriver to remove or install. Take it easy if you try to remove it its kind of fragile. If the bottom half doesn't have part # 40 in the diagram. Or doesn't have a flat looking plug with a screw driver slot in the bottom between the drain plug and the drain hole its probably the correct one. What looks like a plug realy isn't, it holds the main discharge jet in on some other numbers of carburetors but your # doesn't have the retaining nut. Some have a month and day stamped on the manifold mating surface when built or made. Never noticed a date on the bottoms, sometimes numbers here and there. Is the 5 and 3 side by side or at different spots?
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Today's Featured Article - A Belt Pulley? Really Doing Something? - by Chris Pratt. Belt Pulleys! Most of us conjure up a picture of a massive thresher with a wide belt lazily arching to a tractor 35 feet away throwing a cloud of dust, straw and grain, and while nostalgic, not too practical a method of using our tractors. While this may have been the bread and butter of the belt work in the past (since this is what made the money on many farms), the smaller tasks may have been and still can be its real claim to fame. The thresher would bring in the harvest (and income) once a y
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