What is the effect of carburetor on top speed?

Theoretically, the carburetor has little effect on the engine speed, unless the selection is wrong and the diameter is too small, so that the engine can not always suck the gas from one cylinder. But when the engine speed is too high, there is no supercharging mechanism, and the intake time of the engine itself is short, so the engine itself cannot suck one cylinder.

In addition, some carburetors can be equipped with a speed limiter to prevent the throttle from being opened to the maximum. Then, the main metering hole is limited to be very small, and the maximum amount of oil can not be supplied.