Looks like a Maverick Engine that ran in Home Shop or one of the magazines. I don't remember the designer off hand, but I'm sure someone will. This is a gearless engine but still 4 cycle. The "beam" rocks every revolution of the crank, but the "cam" on the end does a partial rotation with each rock. This allows it to clear the exhaust valve step and then hit the stem every other revolution of the engine. The governor is a simple flyweight and engaged a catch to hold the valve open. Nice engines!