Carb tuning, larger accelerator pump nozzle?

mopowers said

I believe this is the suggested lower IFR location: Spray some carb cleaner through it and you'll see the path that the fuel flows. Those metering blocks are like cool little mazes. I've always been able to achieve more stable AFRs with the lower IFRs.

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Thanks for the picture. That’s where it goes. I still haven’t learned how to take a picture and write on it. Someday I may get some mastery over the computer. Or maybe not.

And you are correct. Lowering the IFR will produce much more stable AFR at idle.

There is a paper on that. I’ll see if I can find it and link it here.