Carb tuning, larger accelerator pump nozzle?
Throttle nearly closed, Pressure inside the passage to the booster is same as the bowl.
Throttle open sufficiently for air velocity through the booster to create lower pressure in the passage.
Many blocks have an anti-siphon hole in the angle passage. (Sometimes called a kill bleed.)
Although it might slightly delay the start of the mains, it can actually help the flow once it starts.
Discussion here: Another dogleg kill bleed carb - list 80783, 650 VS
Original drawings and discussion here: More in-depth e-hole discussion (with pictures!)
Getting a little off topic, but here's how I can best explain it.
Throttle nearly closed, Pressure inside the passage to the booster is same as the bowl.
Throttle open sufficiently for air velocity through the booster to create lower pressure in the passage.
Many blocks have an anti-siphon hole in the angle passage. (Sometimes called a kill bleed.)
Although it might slightly delay the start of the mains, it can actually help the flow once it starts.
Discussion here: Another dogleg kill bleed carb - list 80783, 650 VS
Original drawings and discussion here: More in-depth e-hole discussion (with pictures!)
