What you have there is a engine that puts out great power and will last forever. A 22x12 prop on this for a warbird is idea. Once the engine is broke in (100 flights or so), you no longer need the spring starter. It hand starts very easy as long as the points are clean and adjusted right. These are great engines and will knock the socks off any new engine out there! Let me be the first to know if you decide to part with it! Paul