It's pretty simple...
A bicycle with a motor is called a motorcycle.
motorcycle - mō′tər-sī″kəl -noun- A two-wheeled motor vehicle resembling a heavy bicycle, sometimes having two saddles and a sidecar with a third wheel.
- A bicycle or tricycle operated by some form of motor as well as by pedals.
- A two-wheeled vehicle having a motor attached so as to be self-propelled.
But don't get me wrong... I love motorcycles. I just don't confuse them with bicycles. Got my first motorcycle at 11. It was a 1953 Cushman Highlander. Never could keep it running. 50 years latter my Mom admitted to sneaking water into the gas tank to keep me off of it...