Pilot air screws - how do YOU tune them.

[BruKen]

Hi guys

I want to tune the carbs this weekend and balance them. As I have a replacement carb set that I cleaned out I will have to re set the pilot air screws. Now I have tuned many single cylinder carbs in the past but all my multi's have been fuel injected. The way I did it for a single cylinder was simply unwind the needle until the motor became bubbly rich. I would then lean her off while the revs climbed until they began to sag again. From there a quarter turn back to rich. After trialing to see that there was no hesitation from prolonged idle to short bursts of throttle (while on and riding the bike) I would leave it as set. If there was hesitation I'd richen up in 1/8th increments.
Obviously I cant do that on a multi. How do you tune yours? (run on one cylinder : if that's even possible?: while tuning as above and then performing the hesitation test on all carbs simultaneously?)

[Mustang]

the correct way is with an CO2 gauge screwed into the bungs in the exhaust headers ...........you should be between 1 -2 % CO2

Now for us lowly folk who can't afford the damn gauge

just set the pilot screws at 1 1/2 turns out and it will run pretty damn good !
the carb sync is the most critical ....I use a morgan carbtune

[BruKen]

I have a recently purchased Morgan carbtune too. This will be it's first use.

Thanks.

[nightrunner]

Mustang about summed it up.  But the manual specs are 2.5 - 4.5 % CO outside the US and 1% for US models.  I shot for about 1.5 - 2% and it runs and starts pretty easily.