You have answered my question. And the answer is to give this plane back to my dad and let him put a motor on it. I will stick with .40 size planes and helicopters. Going back to glow fuel for a big plane in not an option for me. The nearest hobby shop with fuel is 90 miles away. As for the OS 160 ,I tried power master and byrons 5% and 15%, numerous glow plugs, on board glow system, closing off one of the pitts stacks and anything else the "expurts" suggested. It would always lean out in the air and die. I think I just had a dud. Anyway I sold the Ultimate and the engine went with it. Of course I let the new owner know of the problem before he bought it.