The Bellingham Herald

When does putting a small motor on a bicycle make it a moped in the eyes of the law?

Question: I am considering putting a small gas motor kit on a mountain bicycle. Does it then become a moped? Does it require a license? Can It be driven on sidewalks? Or bike paths? Or freeways? Any ...
News Tribune

So, you want to add a little vroom to your bicycle. Here’s what state law says about that

Q: My son, who does not drive, would like to put a motor on a bicycle. Can you tell me what the law is regarding this on Tacoma streets? Is there a difference whether it is an electric or gas motor? — ...
Hackaday

Building A Stirling Engine Bike

Over on his YouTube channel [Tom Stanton] shows us how to build a Stirling Engine for a bike. A Stirling Engine is a heat engine, powered by the expansion and contraction of a working fluid (such as ...
autoevolution

“Cyclist” Learns That a 50cc Engine on a Bike Makes It Not a Bike Anymore

Get yourself one of them electric bicycles and you will receive some form of guidance or counseling on where and under what conditions you can ride it on public streets. Get yourself a second-hand ...