Does anyone have clear information on the various China manufacturers of the 80cc (68cc swept volume) 2 cycle bike motors by manufacturers' names with comments as to which ones are better and why and which bike motor dealers sell which manufacturers? Its a bit confusing when reading up on the history but you come across names such as Nantong Jiali, Jian Yan, JL, Han Dan, HD. YD. . . others? Whats up with this? Thanks!