If I have some time this weekend I will upload a video of the bike
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I believe the engine is a copy of this Yamaha engine.
http://3.bp.blogspot.com/-WEygzcfllA...e-medium_1.jpg
That engine if an OHC is typically a Zongshen and is found in a ZS200GY as the ZS167FML.
The body is copy of the Yamaha FZ-S, which are made in India.
http://4.bp.blogspot.com/-DzaA6ZMUqO...12-640x544.jpg
Chongqing Union Co,.ltd.is not likely a manufacturer, likely a wholesaler.
The serial number on your motorcyles frames steering neck begins with three characters that will tell us who actually makes it.
I am not sure about the 164FML? That would likely be a CG200 and yours looks different to that type engine, but the image is very dark around the engine.
Take a few good close up photos of the engine, then post them on http://www.chinariders.net/.
I am sure they would be interested and may be able to offer some advice?
I think it may have the same engine as the keeway 200cc they are a QJ164FML, but they are a OHV engine I believe.
sorry for the confusion, I believe the engine is made by QJ Qianjiang, likely the same as this engine and an OHV 200cc
http://attachments.motorfans.com.cn/...tROGMr6504.jpg
http://www.mychinamoto.com/forums/sh...g-Motor/page11
http://i784.photobucket.com/albums/y...jiang/Blue.jpg
Ok these are not the same and this is a 150cc OHC, but parts look the same to me.