Engine in question is a st 60. I have put 50 flights on the thing and it has not let me down yet. I was under the impression that the high speed needle should be out approx. 1 1/2 turns. All other engines I have ever flown have been like that. This one runs rich until I turn the needle in to .75 or less turns out with a slight increase in rpm with the nose pointed up. I have been concerned since the beginning but it hasn't given any reason for concern. Paranoid...maybe, but I wanted a Super Tigre rep's opinion. For the record, it turns a 13x4W at 10,400 all day long. Thanks for your help.