I bought one of those 250 Hi Bird. It's got a single. The engine is awesome. I've put over 10,000 chino-miles on it, and it still pulls strong. But, the engine mount and exhaust pipe sux big time. The frame is basically a GY-2, which sux too.
The Hensim appears to have a GY6-style frame (full perimeter). It looks very nice.
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Chinabikeless
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