by 
The Curious Bag
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Motorized bicycles are a great way to get around with ease and efficiency, especially for those who have no driver's license. But these vehicles are closely regulated and are subject to individual state laws.
Definition
Motorized bicycles fall under the original legal definition of a Moped. This word is a combination of "motorized" and "pedaled."
Engine
Most states say a motorized bike cannot have an engine displacement of larger than 49cc without being considered a motorcycle.
Horsepower
The engine of a motorized bike cannot be factory-rated higher than 2 horsepower in most states. But there are few laws pertaining to aftermarket modification for increased power.
Speed and Transmission
Most states limit engine-only top speed to 30, but some allow 35. Mopeds may not have a manual transmission of any kind; otherwise they will be considered off-road dirt bikes or motorcycles.
Electric Motors
Some states regulate the output of electric motors to 1500W, but all limit electric-only top speed to 20 mph. The bicycle must be pedaled in order to exceed that speed.
Source:
Electric Vehicle Mall: Florida Moped Laws
ZoomBicycles: Motorized Bicycle Kits
Bicycle-engines.com: Installation Instructions
More Information:
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