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This UFO is supposed to increase the efficiency of the Mikuni carbs, due to the "flawed" design of the bottom of the slide. Optimized by shaping it and filling in the volume under the slide, that decrease in empty void volume by filling it in transmits into a stronger pressure signal at the main and pilots, and distributes and atomizes the fuel more efficiently higher up into the air flow. No reason to go to a smaller carb and lose top end air flow, when it can be increased by making the flow more laminar through the venturi.
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