I still don't have the three-wheeler home , but I did look at it again.There is a small electric motor included with it.A tag on the motor reads General Engines EPD. I thought that was odd as it is a motor, not an engine.An engine is gas or diesel but a motor is electric , right? I believe that it is some kind of industrial motor.The drive end has a wheel about 2 inches in diameter and made of material that looks like a course wheel for a bench grinder.I don't think I would mount in on a bike myself.The seller of the bike has another three-wheeler that the motor was mounted on.The front fender was cut off just in front of the forks to mount it to run against the front tire. He has no interest in bikes and only had the two because his wife wanted one to ride.The one she wants to keep is a Royal Enfield. I am going to try to convince them to sell it to me also.I will post photos when I can. 8)