ok here is what I got, Four Star 60 Ive got an OS 91 FS in the nose, Heres my problem, a guy I fly with also has the 4*, with a Magnum 80 four stroke. his four star will do circles around mine, it seems to have more power, and it is alot faster than mine, Im swinging a 14x8 prop, and this is the only plane that this engine has been in, why shouldn't mine out perform his?