My new rebuilt O-360-A1A has a slight stumble when accelerating through about 1100 rpm. Slightly leaning the mixture seems to minimize or eliminate the stumble. The carb has the single piece venturi which has somewhat of a reputation for stumble on acceleration. We will be pulling the carb apart tomorrow to perform the float SB. We will set the float level then but is there anything else we should be looking at? It is a parallel valve 180 hp Lycoming with a 3 blade Catto. I am wondering if the combination of the one piece venturi and the 18 pound prop are the reason. We are ready to put this puppy in the air as soon as we convince ourselves we don't have a problem here.
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