I'll second the thumbs down on the Magnum engines, everyone I have ever seen is only good for a paperweight or if you tie a string around it it could be used as an anchor for a small boat! This is not to say that there are no good ones out there but this is my experience. Thunder Tiger is right there with OS on the reliability scale with OS, I believe they were designed by the same guy that did OS, Don't remember where I heard it, does anyone know if this is true?

Chris