Carburetors kinda just put the gas out there and allow the air that's rushing past to pull fuel while it goes. You would need to invent the DFCO-capable carburetor. There were computer-controlled carburetors on cars for a short time, and I'm not sure what the computer was able to control, but possibly they could DFCO. I don't know if bikes have them or not.
You will get the same idea about sudden acceleration on any non-hypermiling forum. Having never operated a motorcycle I can't say for sure whether or not it's true for motorcycles; for cars it is definitely not true. A car driver who cannot brake and steer out of danger is a dangerous driver, not roadworthy, and absolutely should not be using a manual transmission.
Vehicular bicyclists do much of their riding at or near prevailing motor vehicle speeds and operate as a motorcyclist does but without the ability to suddenly accelerate, for what that's worth.
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