I'll just leave this here.http://www.indiancarsbikes.in/automotive-technology/crisp-punch-ported-throttle-slide-cv-carb-9399/
The ports are sized for maintaining the highest practical manifold vacume and therefore the best fuel atomization, economy and combustion efficiency. In the early to mid 90's this same mod was popular with Harley EVO motors. Over use of the right wrist to make use of the mod had more of an effect on fuel consumption.
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