You may want to just go to the "2300 Testing and Experimenting" as this subject was really beat to death. The ST line does have carb issues and have simple fixes but you can decide. I like them and are my prefered sport engine of choice. To be honest here, I think its mostly a tuning issues but at the same time, I would not trust it for any 3d at all. I don't do 3d and never will. I run warbirds and speed type, so I really don't have issues. I just throttle up to take off and back down to land. I have the 2300 and some G90's, .45 and like em.