OK, many terms out there, please point out the passage you are talking about in the below circuit diagram:



Is it the:

1) RESTRICTOR
2) IDLE WELL TUBE
3) IDLE AIR BLEED
4) IDLE RESTRICTOR

LOL...yeah, many different points to adjust...which is what I feel makes it such a remarkable carburetor.

The IDLE WELL TUBE is 0.039" in my 9810S carb.

I have modified the IDLE AIR BLEED to accept brass plugs so that I can control the amount of air bleed, that was done mostly due to the lower idle vac signal, however playing with the settings ultimately led me back to the stock size.

I also removed the plug that leads to the RESTRICTOR, but I did not actually adjust the size of that passage.