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A Bum Bike is any sort of bicycle that has been modified with a 2 stroke engine kit. These bikes are operated by a variety of people including the homeless population who has taken a liking to this quick and cheap form of transportation. They are great for getting around town if you don't have a driver's license, the kits can be found for less than 200$. It's not uncommon to a see a bum or a junky ripping around on one with a few bags of soda cans and some stolen goods.
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