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All a carb is, is an inclosed, metered/controlled siphon effect unit placed in the intake air passage of an engine. High side dumps fuel via the main metering jet and high side mixture screw to the incoming air and is "mixed" by the turbulence/vortex of that rushing air. The low side, on the other hand, is routed past either a fuel metering screw or an air metering screw and is dumped below the throttle plate to give the engine something to burn at those times when the throttle is (almost) closed. Also, the float/needle & seat assembly is nothing more than a level control for the waiting liquid fuel much like a bowl/valve-assembly in a bathroom toilet tank. Next to the carb which is used on an oil burning furnace, tractor carbs are about as simple as it gets. Things start to get a little more complicated when you get into automobile carbs because differing speed conditions start entering the picture and have to be controlled also. Allan
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