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The primary difference in why some carbs make more power than others is what obstructions remain in the carbs when those carbs are fully opened.
In the CV carbs (constant velocity) our bikes come with a throttle plate and it's shaft will remain, though the plate will be turned sideways to minimize restriction. In most non-CV carbs the throttle cable pulls a slide up and out of the venturi, leaving essentially nothing in the way of air flow. For those carbs the difference is in just how cleanly the slide tucks out of the way and what other small protrusions, or more likely depression, remain within the venturi to disrupt smooth flow.
There are many other differences, but the ones I brought up are the ones that impart maximum flow, and therefore, maximum horse power.
From reports of those who have swapped their CV's for non-CV performance carbs, the results seem cost effective in comparison to opening your engine. If you decide to then open your engine afterwards, you'll have the right carbs for the job already mounted.
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