Have you ever modded an O'donnell .21 SS? They are really cheap over at Towerhobbies and wondering if i sent it to you. Would you be willing to mod it? I have one now with a gallon or so on it. Overall Im pretty happy with it just would like a bit more power. Not saying they arent but if your engines are what you say they are and what ive seen from your vids then this little motor should move really well with some of your handy work.