At the heart of the 2007 Chang-Jiang BD 50QT-5D 125 scooter motorcycle, Chang-Jiang utilizes a 125 cc (7.6 cu in) air-cooled single cylinder, four-stroke layout. In factory specification, peak output is rated at 3.4 HP (2.4 kW) at 7,000 rpm. With a specific output of 27.2 HP per liter, the engine character is prioritizing low-RPM tractability, mechanical longevity and relaxed throttle response over peak redline numbers.
On the scales, the BD 50QT-5D 125 measures 90 kg (198 lbs) dry. Rider ergonomics and chassis geometry center around a 1,300 mm (51.2 in) wheelbase engineered for quick, flickable steering geometry. The 6-liter (1.6 US gal) fuel tank paired with a rated consumption of 1.9 L/100 km provides an estimated theoretical range of roughly 316 km (196 miles) between fill-ups, while factory top speed is listed at 45 km/h (28 mph).
Specific Output
27.2 HP/L
Theoretical Range
~316 km (196 mi)
Engine
Displacement125.0 ccm (7.63 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Power3.4 HP (2.4 kW)) @ 7000 RPM
Compression10.5:1
Bore x Stroke39.0 x 41.5 mm (1.5 x 1.6 inches)
IgnitionCDI
CoolingAir
Transmission
ClutchCentrifugal
Performance
Top Speed45.0 km/h (28.0 mph)
Fuel Consumption1.90 litres/100 km (52.6 km/l or 123.80 mpg)
Greenhouse Gases44.1 CO2 g/km. (CO2 - Carbon dioxide emission)
Chassis
Wheelbase1300 mm (51.2 inches)
Ground Clearance110 mm (4.3 inches)
Wheels & Brakes
Front Tyre3.5-10
Rear Tyre3.5-10
Front BrakesSingle disc. Hand operation, disc
Rear BrakesExpanding brake (drum brake). Hand operation, drum
Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.
Power
Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.
Weight
Compare weight carefully because it affects low-speed handling, parking and confidence.
Fuel Capacity
Fuel capacity helps estimate touring range and how often you may need to stop.
Brakes
Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.
