Originally Posted by
Raleighcopter
My os ft120-ii with airbleed carb doesn't have a barrel that moves sideways and the cylinders run basically the same. There's probably no difference from front cylinder to back because the fuel doesn't enter the cylinders through the crankcase. I don't believe the cylinder offset makes any difference.
I strongly believe that it has to do with the liquid part of the mixture not entering the plenum (T-fitting) exactly centered. On the radial this appeared to be the problem and the three tiny holes in the elbow fitting cured that effectively.