Motocross Bikes
1990Kawasaki KX 125
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The 1990 Kawasaki KX 125 is a lightweight motocross bike designed for amateur and intermediate riders seeking an accessible entry into competitive racing. Powered by a 37.8 hp two-stroke single-cylinder engine, it delivers responsive performance and nimble handling characteristic of 125cc class machines. Known for its reliable six-speed transmission and proven platform, the KX 125 remains popular among young riders and privateers in motocross competition.
- Capacity
- 124.0 ccm
- Engine
- Single, two-stroke
- Gearbox
- 6-speed
- Dry weight
- 86.5 kg
- Seat height
- 945 mm
- Power
- 37.8 HP (27.8 kW)
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Built purely as a competition motocross machine for racing on dirt tracks, not as a street or all-purpose bike.
- Built for
- A raw, high-strung racing tool that rewards aggressive riding with sharp handling and explosive acceleration out of corners.
- Not ideal for
- Not suitable for commuting, touring, passengers, or riders seeking comfort, low seat height, or road-legal usability.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Engine
- Capacity
- 124.0 ccm
- Power
- 37.8 HP (27.8 kW)
- Torque
- 24.5 Nm (2.5 kgf-m)
- Engine type
- Single, two-stroke
- Power/weight ratio
- 0.4370 HP/kg
- Bore x stroke
- 56.0 x 50.6 mm
- Compression
- 8.2:1
- Cooling system
- Liquid
- Fuel system
- Carburettor
- Starting
- Kick
- Ignition
- CDI
- Lubrication system
- Petrol Mix (32:1)
Transmission
- Gearbox
- 6-speed
- Transmission type
- Manual
- Final drive
- Chain
Dimensions & weight
- Wheelbase
- 1445 mm
- Overall length
- 2135 mm
- Overall width
- 815 mm
- Overall height
- 1215 mm
- Seat height
- 945 mm
- Dry weight
- 86.5 kg
- Fuel capacity
- 8.50 litres
- Ground clearance
- 340 mm
Chassis & suspension
- Frame
- Perimeter style, high-tensile steel with aluminum subframe
- Front suspension
- Inverted Forks
- Rear suspension
- Monoshock
- Front wheel travel
- 310 mm
- Rear wheel travel
- 330 mm
- Rake (fork angle)
- 25.5°
- Trail
- 108 mm
Brakes & wheels
- Front brakes
- Single disc
- Front brakes diameter
- 220 mm
- Rear brakes
- Single disc
- Rear brakes diameter
- 190 mm
- Front tyre
- 80/100-21 51
- Rear tyre
- 100/90-19 57
Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.
What changed, year to year
Differences highlighted| Specification | 1990 | 1994 | 1998 | 2002 | 2006 |
|---|---|---|---|---|---|
| Capacity | 124.00 ccm (7.57 cubic inches) | 124.00 ccm (7.57 cubic inches) | 124.00 ccm (7.57 cubic inches) | 124.00 ccm (7.57 cubic inches) | 124.00 ccm (7.57 cubic inches) |
| Dry weight | 86.5 kg (190.7 pounds) | 86.5 kg (190.7 pounds) | 86.5 kg (190.7 pounds) | 87.0 kg (191.8 pounds) | 87.0 kg (191.8 pounds) |
| Seat height | — | — | — | — | 945 mm (37.2 inches) |
| Fuel capacity | 8.50 litres (2.25 gallons) | 8.50 litres (2.25 gallons) | 8.50 litres (2.25 gallons) | — | 8.20 litres (2.17 gallons) |
Illustrative - generated automatically by diffing the year records already on file, not a manufacturer-published changelog.
Rider Reviews
Common questions
What is the engine size of the Kawasaki KX 125?
The 1990 Kawasaki KX 125 has a Capacity of 124.0 ccm (7.57 cubic inches).
What engine power does the Kawasaki KX 125 have?
The 1990 Kawasaki KX 125 has a Power of 37.8 HP (27.8 kW).
How many gears does the Kawasaki KX 125 have?
The 1990 Kawasaki KX 125 has a Gearbox of 6-speed.
What is the torque of the Kawasaki KX 125?
The 1990 Kawasaki KX 125 has a Torque of 24.5 Nm (2.5 kgf-m or 18.1 ft.lbs).
How much does the Kawasaki KX 125 weigh?
The 1990 Kawasaki KX 125 has a Dry weight of 86.5 kg (190.7 pounds).
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