Built around Kawasaki's cross - motocross motorcycle platform, the 1990 Kawasaki KX 125 features a 124 cc (7.6 cu in) single cylinder, two-stroke configuration. In factory specification, peak output is rated at 37.8 HP (27.6 kW) at 11,500 rpm while maximum torque reaches 24.5 Nm (18.1 lb-ft) at 10,500 rpm, transferring power to the rear wheel through a 6-speed gearbox. With a specific output of 304.8 HP per liter and a 1,000 rpm working window between peak torque (10,500 rpm) and peak power (11,500 rpm), the engine character is placing it firmly in high-revving supersport territory where top-end breathing dominates.
On the scales, the KX 125 measures 86.5 kg (191 lbs) dry, translating to a power-to-weight ratio of 0.44 HP/kg (2.29 kg per horsepower). Rider ergonomics and chassis geometry center around a 1,445 mm (56.9 in) wheelbase engineered for balanced agility and highway composure. The 8.5-liter (2.2 US gal) fuel tank supports practical everyday commuting and weekend road stints.
Within MotoLibrary's Kawasaki archive, this model family spans 5 indexed model years from 1990 to 2006, allowing buyers to track year-over-year changes in emissions tuning, weight and equipment.
Specific Output
304.8 HP/L
Power-to-Weight
0.44 HP/kg (2.29 kg/HP)
Power Band Window
10,500–11,500 rpm
Engine
Displacement124.0 ccm (7.57 cubic inches)
Engine TypeSingle cylinder, two-stroke
Engine DetailsSingle cylinder, two-stroke
Power37.8 HP (27.6 kW)) @ 11500 RPM
Torque24.5 Nm (2.5 kgf-m or 18.1 ft.lbs) @ 10500 RPM
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.
Torque
Torque is useful for judging real-world pull, especially for touring, commuting and loaded riding.
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.
Suspension
Suspension details can matter for comfort, road feel and long-distance riding.
Transmission
Transmission and final drive affect maintenance, smoothness and everyday usability.
