Thanks again Ken for your suggeations. I will give this one a try although my track is sitting under a layer of leaves right now. Hope to make a last run of the season yet though.Giving the mogul a clean I remembered something which might be important! I sometimes had the burner blow out at start up, when big globs of oily water were exhausted. Following various trials I decided that the problem was the exhaust pipe going up the smokebox into the chimney. I unscrewed this to see if it made a difference. IT DID! Not only no more blowing out but much freer running. Maybe you should try that?
Brian