Best carb ever made IMO. I have one on an OS 1.08(best engine OS Made) and the ONLY time I ever had to adjust the idle mixture was when my ring would wear out. I set it when new, and one day the idle started screwing up and I fiddled with it a bit and got it flyable. I noticed that the compression was a bit low and when I tore it down, the ring was shot. I could actually slip the piston back in the sleeve with any part of the ring on the anti-rotation pin. New ring, the idle mixture went right back to where it was.
I am on the third ring, and 4th set of bearing in that motor. The sleeve is still nearly perfect.