Al Day Dan, I got to disagree with you about soft mounts. If you use the right soft mount they are fine & will not harm the engine. If they are too soft & let the engine move around to much, try a different one. Lord mounts & Hyde mounts seen good. By the way a Kavan 50 comes with soft mounts. Race planes do not use then much, because of extra weight & they need more space for installing them.
Capt,n