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If you mean the pilot mixture screws on the sides of the carbs, no O ring just a spring. And they are fuel screws, not air so backing the screw out riches the mixture. I run mine at 2T out from bottom.

Yeah I looked at the parts break down, there is only a spring, but I have been paying attention to those screws and notices that there is a small amount of gas around the screw? Can I put Teflon tape around the threads?

In 35 years I have never seen gas come out of those screws. That would indicate a problem that needs fixing, and not just sealing with tape.

Fixed! Yup I finally spent like five bucks on some hose, had some Corona bottles and made a rig to sync the carbs. It was way off from my bench sync, hmm probly should have been less lazy would have avoided a headache! Only thing I find funny is I have the secondary carb pushing a little more vaccume that's seems much smoother idle then when I set them both spot on the same?