Cherrypicker
Member
I have rudimentary knowledge of how the carbs work, role of the main jet, needle jet, and pilot jet. I get how whether we are talking round slide or flat slide or even the CV carbs, that needles with tapers and grooves and clips, adjust how much fuel will flow at a specific throttle opening. I think I understand that the pilot air/fuel screw fine tunes the idle circuit, less than 1/4 throttle opening. I am less clear about the design of the slide, particularly the round slide. But I am finding it difficult to find any clear explanation the role of several small openings/hole on the intake bell play into the fuel and air metering business. Seasonally I find myself going through typical carb cleaning, mainly checking for plugged pilot jet, and insuring the float bowls don't have dirt in them. I try to insure that these small holes 2-3 at the very bottom of the bell, possibly on the side, and I think this may be an air bypass for the choke (enrichener) circuit. Some have a hole at the top seems that this might be for CV type carbs. One of these holes will often have a small brass jet, and I've heard it referred to as an "air bleed". These orifices are prone to plugging just like the pilot jet and I will try to flush them out with carb cleaner, air pressure or the thin wire from a welding tip cleaner. So basically hoping someone out there could point me in the right direction so I can identify their role and routing through the carbs.