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Paul,
You're thinking Dellorto -- Webers have the low-speed air correctors built into the idle jets. I've been experimenting with that, but it's still the emulsion tubes that have the most impact on the problem.
Not sure how you can say that I should be using F9 or F16 tubes when there are so many differences between how motors are modified, how intakes and exhausts flow, etc. A change in header alone would require a change in tubes.
My stock B20E prefers F2 to F15 or F16. That one isn't demanding and was pretty easy to sort out.
Mike Aaro can't tell me which jets to use because my motor isn't quite like other motors he's designed. In fact, his recommendations for idle and main jets seem about right, but the tubes are very picky in this one.
--Phil
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