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I guess it could be down to something like ... the carbs are so high on a monster that there is very little pressure head acting on the floatbowls and hence the float valves may be more prone to leaking ....?
Though why FCRs should be more susceptible than the std carbs I can't imagine.
I suspect that the height of the float bowls vs the position of the fuel outflow on the tank is not the reason.
The pressure to close the needle valve is from the flotation of the float bowls and that should be a constant as the volume of the float bowls and the "floatieness" of the the floats does not change
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