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I don't know if this is correct in practice, but here's my theory. The accelerator pump is used like a bandaid for when the air velocity through the carb is insufficient for desired fuel flow. So my theory is the carb w/o the accelerator pump has better designed fuel circuits, or is just smaller diameter carb giving it higher velocity. So I would think the one without an accelerator pump would be better for fuel economy. the carb without the accelerator pump could be just barely good enough to not require one, and was maybe just cheaper to build, but has no real beneifit.
... If the carb w/o the pump has a smaller bore, I think it would be better. If they are the same size, I would just try to find out how the 2 motorcycles were suposed to be different, if one would be better suited to lower speed riding, or if one was supposed to be higher peak hp, higher speed bike.
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