The engine shown is a YS FZ-140 (specifically the 1.40FZ model), a high-performance, supercharged four-stroke RC airplane engine manufactured by Yamada Manufacturing Co. in Japan. In used condition, sold as untested. Turns over freely with good compression. Would likely require a service prior to use or could be used as parts for another project. Appears to be missing at least one small rubber connecting pipe. Any questions feel free to ask.