I couldn't tell you what you were doing, but I think it would be a disservice to advise using a .25 with the Sturdy Bird 2. Certainly experienced pilots could and do fly the plane with a .25, but as a powerplant for a novice I strongly dissagree. If you have a problem with my humble opinion, censor me.......you are the moderator, just remember it wasn't I that first took up issue with another's opinion.