The original CH-4
was rumored to be powered by the Limbach MD550. Limbach started out as a German company, but was bought by the Chinese in 2011. Production now takes place in Xiamen. Apparently an upgraded version of CH-4 was powered by the Austrian ROTAX-915IS. Now, ROTAX-915IS has been replaced by the 118kw Skylark DB416 engine (2nd and 3rd image) made by Hangrui Power (航瑞动力).