, and what groove in the needle is the clip in???(from the blunt end). This is just a curiosity thing for me.
When the bike is idling, it is running off of the pilot
circuit. The fuel flow is almost completely controlled by the PMS
(there may be fuel slipping past the needle at 950 rpms
because of the overlap). At 3 1/2 out, you are getting to the point where your almost as rich as your going to get on the idle circuit. Some members are further out then that, but some of us have bumped the pilot jet from the #35, to a 37.5 or even a # 40, so we can get the PMS back in to somewhere close to 2 1/2 to 3 turns out. Factory is about 2 1/2 out.
If you think your lean, then see about stepping up in the size of the pilot jet, or back the PMS out instead of screwing it in. Be careful how far you back it out though, because the further out it is, the less pressure on the spring, and it can vibrate out and get lost. When I did this, and was tweaking the PMS, I warmed the bike up good, and then turned the PMS in until I got the lean stumble, and then backed it out looking for a rich stumble on the other end and couldn't get there. I went to the 37.5, and I'm at 3 now. However, my bike would still idle consistently even with the PMS at 3 1/2, and with the 35 pilot.
Your old school hot rod rules are good here as well. Excessive carbon build up and or black smoke from the exhaust indicates a to rich condition. The plugs will also show carbon buildup instead of being a nice light tan color.
Is the bike running good everywhere else but at idle? No backfiring through the exhaust or carb
I'd recommend ditching the AIS
altogether. You can get a removal kit from barons, that'll have either plugs, or caps depending on the year. It may not have a single thing to do with this problem, but removing it is cheaper then replacing parts on it, if it is a problem. It will give you no additional performance, but it causes an annoying lean popping in the exhaust, with aftermarket pipes. As a plus to one less thing to worry about, it also cleans up the front of the motor over top of the starter, and lets more air flow around the jugs.