I wrote--"you can use a tachometer to achieve the highest idle rpm by adjusting each carb mixture control-- but leave the mixture adjuster alone at that point." derek uk answered--"That would appear to be contradictory."
Perhaps I was not clear with that wording. I was reacting to the original poster's comment in his post that he finds the highest rpm and then goes a one flat farther. Setting the initial adjustment to 12 flats is a good starting point but may require a bit of fiddling richer or leaner to get the setting closer to ideal with the motor running -- and then the pin lift to check and make adjustments as necessary. I give the throttle a momentary full blast to be sure the motor accelerates instantly and smoothly and returns to idle with each adjustment. I think derek uk and I are pretty much on the same page. -- Dave