Here's the quote from the Kangke web site:
Kangke USA is proud to add JBA engines to their line of quality products. Jiangnan Blue Arrow manufacturing is a trusted name in radio control engine production throughout Europe and Asia for many years. JBA designs and manufactures engines for airplanes, helicopters and cars and has been producing engines for other brands for many years. Only recently has JBA offered their line of engines bearing the JBA name. Their ISO9001 production facility is state-of-the-art with CNC machining, extensive quality control and an ongoing research and development that exceeds the industry standard in every aspect. Annually, JBA produces more than 200,000 engines for the radio control hobby industry.
JBA products consistently exhibit stable performance, operate through extreme pressures and temperature ranges, have reduced weights, wide operating and adjustment parameters, smooth running, and high horsepower output. From design through production JBA has invested every possible resource to produce the highest quality engines, but at an affordable price.
JBA engines come in two-stroke displacements ranging form .12 (2.0cc) to 1.20 (19.7cc) and horsepower output from .45 to 3.1. All JBA engines have a one year warranty. Kangke USA will also provide all replacement parts.
Engines are shipped with mufflers and are pre-run at the factory to ensure easy starting and performance. Engines are equipped with a low-speed needle adjustment and a high-speed adjustment. JBA suggests 10-15% nitro fuel with glow plugs in the medium to hot range.
Please keep in touch an JBA released their line of 4-stroke and gas engines in the near future.
The company web site says they are in Xiangtan City in Hunan province.
I would bet that a lot of the Chinese engine manufacturers use the same suppliers for many parts. This may account for the similarities.