Hi Guys
Jonathan, I hate to tell you but Yes they do. I carry American Lifan and Redcat. I had a Redcat R9-X 90cc pit bike here and a A. Lifan LF110GY-D 110cc pit bike. Both bikes where made by Lifan in China but the LF110GY-D was made better. Better welds, different bolts, handlebars etc. All A. Lifan bikes have their parts stamped with the L or LF. Remember how Suzuki used to put their S on almost every bolt so does A. Lifan, on their engines. I talked to one of the guys on here a couple of weeks ago about a problem he was having with his brothers GY-5. He owns an A. Lifan where his brother purchased a Grey Area Lifan and he told me with the two bikes next to each other there are big differences. If you wanted to import Lifans from China they would make them to your specs to cheapen the price. Yes Lifan does make bikes that have different names on them and they sell a lot of engines, but they are made to those manufactures specs. You have the same thing with Linhai Yamaha in China and others.
http://www.linhaigroup.com/english/contact.asp
http://www.yamaha-motor.co.jp/global.../01/joint.html
I hope this helps.
Bruce