simplified Chinese: 长江; traditional Chinese: 長江; pinyin: Cháng Jiāng) is the transcribed brand name of motorcycles that were once manufactured by the China Nanchang Aircraft Manufacturing Company. It takes its name from the Chang Jiang River, also known as the Yangtze or, in English, the Long River.
CJ750The CJ750 motorcycle is based on the 1956 Soviet IMZ (Irbitski Mototsikletniy Zavod) M-72 which was derived from the 1938 BMW R71. Nearly all of them have sidecars. They are often erroneously referred to as BMW " " when in fact, they are of the IMZ M-72.
Production began in the late 1950s or early 1960s. (Different sources cite different dates.) They were originally produced for the military and are powered by an air-cooled, four-stroke, opposed flat-twin engine displacing 746cc. The rear wheel is shaft-driven.
The most common models are:
The M1 which has a sidevalve (flathead) engine and a 6V system. This model is a clone of the M72 and closely resembles the 1938 BMW R71.
The M1M is also a sidevalve, however it uses a 12V electrical system and is with a reverse gear. It also has an electric starter where the M1 has only a kick-starter. All of these enhancements were by the Chinese.
The M1S (or "Super") uses an overhead-valve engine, 12V electrical system, electric starter and reverse gear. The OHV system is of Chinese design.
All three models use the same frame and sheet metal. The M1 and M1M are nearly identical in appearance, but they can be distinguished by observing certain details.
CJ technological history includes racing bikes, experimental engines and futile attempts at modernizing the appearance of a long obsolete machine. Beginning in the mid-1980s, over a decade after the normalization of relations between China and the USA, China opened its markets to motorcycle manufacturers which expedited the end of CJ750 mass production. Today, the marque is kept alive by interest from foreign .
HistoryThe CJ750 originated with the 1938 BMW R71, then, by way of the Soviet Dnepr M72, found its way to China as the Chang Jiang.
Early ProductionIn 1950, the Liberation Army Beijing No. 6 Automotive Works developed a military motorcycle by reverse engineering a German Zundapp KS500 motorcycle. The Zundapp-based machine entered production in 1951. 4,248 were built before military motorcycle production was transferred to the Hongdu and Xingjiang machinery plants. Both remain subsidiaries of the state-run aeronautics industry to this day.
By the mid-1950s, the Soviets considered the M72 to be obsolete. China would soon acquire all the tooling and produce their own M72s. In light of this, the Zundapp-based machine was abandoned.
The Chinese M72 was named the Chang Jiang 750. According to some sources, it entered production in November, 1957 at the state-owned Ganjiang machinery factory. Early production used Russian M72 parts. Early CJs were nearly identical to M72s.
The Chang Jiang drivetrain has been revised several times since production began. From 1957-66, CJs were equipped with so-called Type I engines and transmissions. This drivetrain was almost identical to those of the R71 and M72.
In September, 1966, production of the Type II engine and gearbox began. It was not until 1972 that the Type II engine replaced the Type I in general use. Continued use of the Type I engine in 1966-72 was the result of a surplus of Type I components. With so many Type I engines in use, parts remained in production until the early seventies. When the military serviced Type I bikes, they would replace the engines and/or gearboxes with Type II components. This was done for ease of maintenance, parts availability, and improved engine characteristics. Bikes with Type I engines often had their original gearboxes replaced with a Type II. Engines manufactured with a serial number of 661802 and higher are Type II.
In the 1960s, the factory was renamed the State-Owned Changjiang Machinery Factory.
In 1969, the CJ750 underwent some minor design changes, primarily related to sidecar frames and headlight-mounted switches. Gas tanks with built-in tool boxes appeared around this time.
In the late-1970s, the factory was merged with airplane manufacturer Guo Ying Hongdu Ji Xie Chang. At this time, a 6V OHV engine with 30 horsepower was being developed. Only a few of these engines can be found today. They were quickly replaced with a 12V, 32 horsepower version.
In December, 1980, a small number of 900cc, OHV engines were produced in response to the acquisition of BMW motorcycles by the armed police. Only a handful of these machines were built, probably less than ten. Only a few 900cc engines have been found.
Modern productionThe 750 OHV upgrade appeared in the mid-eighties and entered production at the Ministry of Aviation and Space Engine Factory in Nanfang, Hunan Province. This marked the introduction of the M1S model.
In 1986, the M1 model was upgraded with a 12V electrical system and a gearbox with reverse, and designated the M1M.
Although the CJ750 is no longer produced per se, many have been restored from old military stock or assembled from parts. The CJ750 has become popular with enthusiasts outside China.
From east to west, a great number of were used in World War II.Being small, light, quick, and easy to conceal, they were good on road and offroad being very adaptable, Motorcycles were perfect for quick reconnaissance aswell as carrying dispatches and communications. And, in being so flexible andversatile, they were always in the forefront of the action. many sidecararrived the wounded.
Early in 1938 BMW began producing an advanced range of motorcycles, BMW R71 isone of them. This included the R71 with a 750CC side valve engine designed tobetter handle the additional stress of a sidecar attachment. After a Huntingtrip with Joachim Von Ribbentrop, German Minister of Foreign Affairs, Stalintook five BMW R71 motorcycles back to Russia. As Germany needed money to finance the war effortand Russia wanted to producea reliable, latest technology, heavy class motorcycle of its own, this wasachieved in a seven year trade agreement signed in Moscow by Soviet Foreign Minister VyacheslavMolotov and the German Foreign Minister, Joachim Von Ribbentrop on August 23,1939. Russianame of R71 is M72. The interested thing is BMW R71 is same non- used by two party GERMAN and CCCP. Many country copy R71 , Japan, France,Swiss, Belgian, Even the American's Harley-Davidson was willing to copy the BMWmotorcycle at that time after capturing a few BMW in North Africa ,This resulted in the Harley-Davidson XA model which alsofeatured a flat twin engine. Since Chinaand the U.S.S.R. were allies, Then, in 1957, the Chinese started their ownproduction under the name of CHANG JIANG 750.The BMW R71 was a perfect solution for Chinese army mobilize ,Chinese rename itto "Chang Jiang" after the longest river in China (3rd longest riverin the world) and entered production during 1957 at an Aircraft ManufacturingCompany", they also made fighter, trainer for China Air Force till today.In 1969, CHANG JIANG 750 bikes had already had some technical changes, In 1980the Chinese built the OHV, 32 horse power, 12 volts electric, as the gear boxwith reverse. Since then, the Chinese CHANG JIANG production has grown to manydifferent types and models, and mess produce CJ750 classical motorcycle bymillions in numbers. Because the CJ 750 M1 and M1M manufactory by the sameoriginal tools as the original BMW designed, thus the Chang Jiang 750 is the closest BMW R71 motorcycle replica you can gettoday in the world comes with technical improvements. Now day CJ fans all overthe world, from China to USto Norway.from New Foundland to Cape of Good Hope, and CJ family still growing andgrowing, how long the Chang Jiang 750 bikes will remind in production by the history itself.
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