Per Humanbeing's post above, your engine is based on the Honda CB200 single. Your engine has an overhead cam, and it is similar in many respects to the Honda XR200, but only in concept. The actual parts (like the cam, cam chain, crankshaft, etc) are dissimilar.
You have a very good engine.
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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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