That's a GY6, and most likely 150cc. There is a 250 version, but it's water cooled. They're very common in atv's and buggies, but they're originally designed for scooters.
Search GY6 on eBay for a ton of available parts.
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Weldangrind
"I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer
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