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What is being called a VM series is just a plain old fashion venturi single stage slide carburetor with a float bowl to control fuel delivery and if you bought a 2021 2-stroke race bike today, that is what will be on it, there is no modern carburetor equivalent. only various models by various manufacturers.
CV refers to Constant Velocity carburetors and there is a huge difference except for the fact that carburetors operate better if they can draw from a large volume of reasonably still clean air and can breathe through a velocity stack which is just like a funnel, a funnel that makes the air flow in a linear direction, not turbulence. Turbulence is exactly why a velocity stack exists, turbulence at the intake creates inefficiencies. Anybody that doubts it only needs to look at the shape of the rubber horn they took off to stick the cheap pod filters on.
CV refers to Constant Velocity carburetors and there is a huge difference except for the fact that carburetors operate better if they can draw from a large volume of reasonably still clean air and can breathe through a velocity stack which is just like a funnel, a funnel that makes the air flow in a linear direction, not turbulence. Turbulence is exactly why a velocity stack exists, turbulence at the intake creates inefficiencies. Anybody that doubts it only needs to look at the shape of the rubber horn they took off to stick the cheap pod filters on.