Air Bleed Lesson by John Kyle
I watched that earlier today and noted that he did say that timing was affected by the high speed air bleed. He didn't go into detail about timing and I didn't hear him say specificly that a larger bleed delays the start of the main circuit. Although that might be what he would say if asked that specifically I don't know. Perhaps change in timing could refer to the rpm point at which the mixture begins to lean or go rich at the top of the rpm range when the high speed air bleed is changed.
It would be cool if someone would repeat the testing that I did to see if they have the same results. More sources with data that either confirms or has other conclusions would be good for everyone.
Anyone with a dyno out there? Or if you don't have a dyno, the no load part of the test can be done by anyone with a carb that has changeable high speed airbleeds. Simply look down the carb as you slowly raise the rpm and watch the boosters for the point when fuel begins to flow from them. Record the rpm . Change the high speed air bleed and repeat.
Why take someone else's word for it when you can test it yourself?