not necessarily true. for 2 strokes and 4. for 4 it's quite
clear cut, the valves don't allow it.
for 2, most if not all have intake reeds which also prevent
backflow of petrol in the cylinder back to the carbs. if you open
throttle wide open, the slide is completely clear of the venturi,
main jet fully open, the movement of the piston will just draw more
and more petrol via the jets (and at wide open throttle, main jet,
which is worse) into the cylinder. even as you turn the fuel tap
off, in a flooded setting, there would still be petrol in your
float bowl for that to happen.
i can't offer a good counter solution, but i would think cranking
or kicking with the throttle CLOSED is a better solution, IF
flooding is the problem.
