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Marvel schebler carburetor manual6/13/2023 ![]() ![]() Carbs with the new venturi were running rough and rich, because the new venturis didn't work well with the original fuel nozzle.Thus, another fix was released, this time a replacement of the fuel nozzle, with one that has holes drilled into it to increase vaporization. Back in 1993, the FAA issued an AD on the Marvel-Schebler MA-3 SPA carb, because of poor design of the venturi.The fix was to modify the carb, and most 150s got that mod, including the one I recently bought.Then it turned out that the guys who had screwed up the design of the carb had screwed up the design of the FIX.
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