A friend of mine recently gave me a Piper Cub. It was given to him some years back and he never flew it. I know it has just been sitting for at least 5 years. I would like to inspect and clean the motor before I try to start it. How do I know what size motor this is? It is an OS Max FX motor. The wing span is about 76" if that helps. I have only been flying electric for the past couple years.

Thanks
Tom