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Phipps: Yes, indeed, there is. Unfortunately, I cannot tell you what it is from memory but this is probably the single most common cause of flooding after a carburetor rebuild by either amateur or professional. Though I cannot recite a specification to you, I can tell you what to avoid: The Y-shaped float in these old carburetors will wedge in the tapered float bowl if the float drops too far. Though this will not normally cause problems when the engine is running due to the level of the fuel in the bowl and the vibration of the engine, it can and will cause problems when the tractor runs out of gas or if one intentionally runs the gas out of the carb when finished with the tractor by closing the fuel valve. When the float contacts the tapered sides of the float bowl and there is no fuel flow into the bowl, the float may wedge against the float bowl sides when fuel next flows into the float bowl, i.e., when one replenishes the tank or next turns the fuel valve on. The float drop adjustment, ignored by just about everyone, is intended to prevent this. Vintage tractor engines need little fuel flow even at maximum output. Because of this, the float drop should be set not far from the conventional float adjustment. If memory serves, the conventional float adjustment is 1/4" from the float gasket. Another 1/4" inch of float drop is more than enough. There it is: More than you ever wanted to know about float drop. Dean
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