Established in 1966, affiliated to the China Aviation Industry Corporation (AVIC), Locating at Yueyang city Hunan province, Changjiang Engine & Machinery Works (CEMW) is a state-owned large scale enterprise in China. CEMW has mainly been engaged in the developing and producing of small aviation engine , engine components ,airplane parts ,750cc air-cooled engine series and other engine products , electromechanical equipments, metal structural parts and so on. CEMW is also a certificated producer of motorcycles and motorcycle engines of the state. With a history of more than 30 years on the 750cc motorcycle engine and 750cc motorcycle manufacturing, Its 750 engine series, including the air-cooled 24 horse power (SV) , 32 horse power (OHV) 750cc engine ,water-cooled 40 horse power 750 cc engine, have become the famous products in the country. Besides, the vintage 750m1 motorcycle and spare parts are also available in CEMW. main products：small aviation engine, engine components, airplane parts, 750cc Engines and 750 motorcycle, gantry loading system for petroleum, Marine jet thruster, Tee Valve for chemical Engineering,Crankshaft assembly 国营长江动力机械厂厂隶属于中国航空工业集团公司，属国家大型Ⅱ类企业。
    在建厂40余年的历史中，工厂主要从事小型航空发动机、发动机零部件、飞机零部件以及其它动力、机电设备和金属结构件的开发与制造。
工厂曾先后试制生产了多种航空产品，既有航空发动机整机的生产，也有航空发动机系列零部件的加工工厂有30多年生产长江750摩托车发动机的历史，一直致力于生产全新24马力，32马力风冷式750CC发动机，拥有曲轴、变速箱体的铸造模具、以及曲轴，飞轮，离合器片，各种齿轮等发动机部件的加工能力，是目前国内仅存的正规生产750发动机的厂家。
主要产品：750CC摩托车发动机,汽车空调压缩机、快艇喷水推进器、化工三通换向阀,750CC摩托车发动机、石油撬装发油平台、电力瓷瓶法兰、叉车减速器主体部件。