The CHANG JIANG 750 motor is the Chinese clone of the Rus M72, who itself is the clone of the BMW R71. The early CHANG The early production was using a lot of Russian M72 parts such as fenders, frames, wheels, ignition keys, switches ,etc….
Even some complete Russian made M72 were recalled CHANG JIANG 750. Some had the Russian engine changed to a Chinese made one. After the Russian copied the R71 and used it successfully during world war II, they sold a couple of M72s to the Chinese during the fifties. Then, in 1957, the Chinese started their own M72 production under the name of CHANG JIANG 750.

SPECIFICATIONs:
Type CJ750 (M1)
Dimensions 2400mmX1500mmX1000mm (94.5inX59.0inX39.4in)
Wheel Base 1420mm (5.9in)
Tread 1100mm (43.3in)
Ground Clearance 135mm (5.3in)
Dry Weight 350Kg (771lbs)
Max Payload 3persons + 100Kg ( 750lbs total)
Top Speed 85km/hr (54mph)
Engine CJ-750
Displacement 746cubic cm ( 45.5 cubic in)
Compression 5.7:1
Start Mode Kick and electric