Here is one picture I found of it, it is a model C, 4 stroke, 4 HP engine. Its a steady speed 4 cycle motor that runs at 800RPM. It is a single cylinder. It is the one on the right had side of the picture in the middle. It is not running but is in amazing shape. I dont think it was made for a scooter as it weighs about 150 lbs I dont think that would fit in a scooter very well either. My guess is that it would be used to drive a pump, or something that could be ran by a wide belt as it has a 4 inch belt pulley that is clutched on the opposite of the flywheel.