[Motohead]

Originally Posted by humanbeing

67mm water-cooled CG250 had 2 main types:
Lifan http://item.taobao.com/item.htm?id=524011100285 / Zongshen: http://item.taobao.com/item.htm?id=523998146869

Maybe I measured it wrong but I came up with 64 mm bore. I'm out of town now i'll check it again when I get back.