the upper holes in the emulsion tube can be soldered up. there's also a hole high up where the tube enters the cluster that i believe is the "economizer" that can be plugged and is absent in some carbs. i think too much is made of having a lot of pump shot. it's part of the bracket racer mentality to go for big pump shots, whether it's needed or not. to me it shows the lack of ability to tune a carb.