Modern Buddy

I recently started to revive my Buddy 125 purchased in 2009 and run for 3 years continuously. We moved and it sat idle for 3 years.

I drained the gas tank, pulled the carb apart and cleaned it up. I replaced the idle jet in the process also, along with the fuel filter. Currently It runs but does not idle well, is a bit low/rough. I ran some seafoam through the tank and now put in no ethanol gas. I adjusted the idle screw all the way down and tightened the throttle cable all that I could.

I will next try a new plug, but beyond that am looking for potential other options to improve the idle.

My buddy has the stock carb with non-adjustable mix. It was run in Utah, and now in Memphis. Could this be a potential reason for the rough idle (thinking elevation)? Is there a way to adjust the mix or do I have to upgrade the carb to one with an ajustable mix to go this route?

Something else?

Thanks in advance!

How many miles on your Buddy, and have the valves ever been adjusted? What's the elevation change, where you were to where you are now?
I've read some talk about being able to remove an epoxy plug on the air / fuel screw and cut a slot in the screw with a dremel in order to adjust it. On a Ruckus it is D shaped and you can remove the screw with a set of small screw drivers, then clut a slot in it. My 2006 had a slot in the screw already.

I was able to get a slotted idle screw here: http://www.epfguzzi.com/scooterpunks/parts/buddy.html Mine was for a roughhouse but if you look around you should find one for the Buddy 125.