Built around Chang-Jiang's scooter motorcycle platform, the 2007 Chang-Jiang BD 50QT-5 pairs a 49 cc (3 cu in) air-cooled single cylinder, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 3.4 HP (2.4 kW) at 7,500 rpm, transferring power to the rear wheel through belt final drive. Internal engine geometry specifies a bore and stroke of 39.0 x 41.5 mm (1.5 x 1.6 inches) with a 10.5:1 compression ratio.
On the scales, the BD 50QT-5 measures 80 kg (176 lbs) dry. Rider ergonomics and chassis geometry center around a 1,200 mm (47.2 in) wheelbase engineered for quick, flickable steering geometry. The 4-liter (1.1 US gal) fuel tank paired with a rated consumption of 1.9 L/100 km provides an estimated theoretical range of roughly 211 km (131 miles) between fill-ups, while factory top speed is listed at 50 km/h (31 mph).
Theoretical Range
~211 km (131 mi)
Engine
Displacement49.0 ccm (2.99 cubic inches)
Engine TypeSingle cylinder, four-stroke
Engine DetailsSingle cylinder, four-stroke
Power3.4 HP (2.4 kW)) @ 7500 RPM
Compression10.5:1
Bore x Stroke39.0 x 41.5 mm (1.5 x 1.6 inches)
IgnitionCDI
CoolingAir
Transmission
Final DriveBelt (final drive)
ClutchCentrifugal
Performance
Top Speed50.0 km/h (31.1 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
Wheelbase1200 mm (47.2 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.
