Chinese mini engines

[Lukegaigermx]

Ok,
I am really sorry about all these questions,but seeing as i will not be saving for an ace 50 engine, and then adding an 88 kit, I am now wondering what engine to fit to my crf50.

I guess i am now looking for a semi auto chinese engine, but as there are so many, i am a bit lost haha.

This guy on planetminis.com has fitted a lifan 86cc engine to his, which looks great and looks just like a crf engine, however i cannot find any on any websites http://planetminis.com/f8/my-fiddy-done-139037.html

This 90cc engine looks good too, and a good price, however, i want an engine that looks like a crf one, but this has a different side casing http://www.tboltusa.com/store/piranh...9cd36dc359b8c4

Another option i was looking at is the lifan 110cc semi autos that stomp sell , however if i was to buy one of those, i would like one of the ones that look like this, however in silver (http://www.mojomotorcycles.com.au/ad...n110_thumb.jpg)

So, i am looking for an engine, that will fit a crf50 frame, is larger than a stock 50, but still looks very similar. Does anyone have any suggestions?

Any help would be greatly appreciated,

Thanks,
Luke