Key performance

27 ch
Power
🔧
745 cc
Displacement
⚖️
370 kg
Weight
🏎️
110 km/h
Top speed
24.0 L
Fuel capacity
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Technical specifications

Engine

Displacement
745 cc
Power
27.0 ch @ 5000 tr/min (19.7 kW)
Engine type
Two cylinder boxer, four-stroke
Cooling
Air
Compression ratio
7.0:1
Bore × stroke
78.0 x 78.0 mm (3.1 x 3.1 inches)
Valves/cylinder
2
Valve timing
Overhead Valves (OHV)

Chassis

Gearbox
4-speed with reverse
Final drive
Shaft drive (cardan)   (final drive)

Brakes

Front brakes
Expanding brake
Rear brakes
Expanding brake
Front tyre
3.75-19
Rear tyre
3.75-19

Dimensions

Fuel capacity
24.00 L
Weight
370.00 kg

Overview

Amid the frenzy of 1990s Japanese sportbikes, the Chang-Jiang 750 FY with its sidecar offered a journey back in time, a rolling anachronism that cared nothing for performance. This machine, a Chinese copy of the pre-war BMW R71, was less a means of transport than a political statement on wheels, frozen in a 1930s design. Its 745 cc flat-twin engine, with a square bore and stroke of 78 mm, produced a laughable 27 horsepower, barely enough to move its 370 kg fully equipped. A compression ratio of 7:1 speaks for itself: this is primitive mechanics, designed to survive on the poorest fuel and minimal maintenance.

Chang-Jiang 750 FY (with sidecar)

The technical specifications are an inventory in the style of Prévert of obsolescence. Drum brakes on the three wheels, a shaft drive with a four-speed gearbox including reverse gear, and 3.75-19 tires that seem to have come from a tractor. The 24-liter tank was a necessity, given that the best friend of this motorcycle sidecar was undoubtedly the gas station, with a top speed peaking around 110 km/h. One can imagine the rider, not leaning into corners, but struggling against the overturning torque and planning overtaking maneuvers several days in advance.

Comparing this Chang-Jiang to anything contemporary, a Honda CB750 or a BMW K75, would be an insult… to the Japanese and the Bavarian. It does not belong to the same universe. Its value lay entirely in its image and indestructible utilitarian function. It was the mount of rural militias, officers of the People's Army, and anyone who needed an off-road vehicle that could be repaired with a hammer and pliers.

Riding this motorcycle sidecar today has nothing to do with piloting. It is an archaeological experience, a lesson in old-fashioned mechanics, and an exercise in absolute patience. It is only intended for the passionate collector of industrial history or the filmmaker seeking a perfectly authentic period accessory. For the globetrotter or the epicure of the road, it is a punishment. But as a relic of a bygone era and a symbol of a certain idea of robustness, it possesses a brutal and undeniable charm, provided you are never in a hurry.

Indicators & positioning

Weight-to-power ratio
0.07 ch/kg
🔧
Volumetric power
36.2 ch/L
In category Classic · 373-1490cc displacement (1962 motorcycles compared)
Power 27 ch Top 85%
24 ch median 50 ch 106 ch
Weight 370 kg Lighter than 2%
171 kg median 215 kg 346 kg
P/W ratio 0.07 ch/kg Top 97%
0.10 median 0.25 0.49 ch/kg

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