I don't recall seeing one, but I would certainly feel good about that motor. Until Taobao bursts into flame, parts will be cheap and easy to get. Probably wouldn't hurt to buy a cylinder, piston and gaskets on spec.
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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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