ORIGINAL: JDW
Wrong Flyboy Dave!
The MOST critical aspect of these carbs is the position of the LOW SPEED NEEDLE relative to the end of the spray bar tube (or nozzle)at FULL THROTTLE.
It is NOT a large gap as you suggest but is about .002in and is very critical. It is NOT critical because it changes the low speed mixture, but because it changes the venturi effect and therefore the fuel draw at full throttle.
I think this is where the Lad went wrong with the theory. The low speed
does have an influence on the high speed, but only to a certain point. This
will vary on different carbs. The gap is really quite meaningless. The way
the carb operates is the important thing.
MB.