Reply to "Vapor Lock"

Check your fuel level in the fuel bowls while you are at it. It could be too low, staving for fuel or too high. The stalling at a hard stop almost sounds like either the rear bowl is set too high and the excess fuel gets dumped into the carb via the vent tubes or the front is too low and the jets become starved for fuel on a hard stop. Either way check the fuel level, try pruchasing the aftermarket clear windows that they sell for future fast checks. Fuel should just leak out of the bottom of the window, I think 1/32" below the threads is optimal.

If that seems to be OK...check the float fuel meter (cannot remember the right term for the fuel flow valve). This is that flat hex nut on the top of the bowl, remove the jam nut and unscrew the valve. It might be clogged or have some material in it preventing the valve from opening or closing when needed. Lastly you can check the carb floats to make sure they are not getting stuck and binding.