Had problem with TO-30 not running except with choke. Figured gas flow problem. Cleaned sed. bowl, drained gas tank, put in new gasket in sed. bowl, pulled carb, cleaned it, replaced needle and seat with version out of TO-35 kit (didn't have kit for 30). No gas leaks, no air leaks best I can tell. Hooked all back up and tractor started and ran very smooth, without choke, but tried to 'run away' which I figured was governor binding somehow. Pulled carb again and can't see binding. Gov. appears flexible. Got to thinking that somehow the 35 seat might be factor, but looking at it it looked same and anyhow all it does is let gas into bowl, so can't see that as factor? Any suggestions?