If you've ever looked at any motorcycle's specifications for any reason (or even some four-wheeled vehicles), you've likely come across numbers like 50cc, 125cc, and so on. But what do those numbers ...

Add Yahoo as a preferred source to see more of our stories on Google. This minibike features a 50cc 4-stroke engine and a 3-speed manual transmission. Uniquely, it also includes a high-low gear ...

Thieves broke into the Norfolk Motorcycle Museum and stole two vintage 50cc two-stroke motorcycles. But the interesting thing is what they left behind.