Here is my .02$. I have a Saito 91 in my 4*60, and I think it is the perfect engine for this platform. Balance is always an issue with this plane because of its long tail moment, so I put my engine as close to the end of my Dave Brown engine mount as I dared. I also substituted a 4*120 landing gear for the soft stock gear, and I came in right at the balance point by just moving the battery under the tank. The plane flies great and is a absolute jewel to land. Just line up on final, and let her settle right in the groove. BTW this is my second plane, and this is a great step up from a trainer.