Motocross Bikes
2025Kawasaki KX 450SR
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The 2025 Kawasaki KX450 SR is a competitive motocross machine engineered for intermediate to advanced riders seeking aggressive off-road performance. Powered by a liquid-cooled 449cc four-stroke with DFI fuel injection and DOHC technology, it delivers strong power delivery and reliability. Known for its nimble handling and responsive chassis, this bike excels in mixed terrain conditions and racing environments.
- Capacity
- 449.0 ccm
- Engine
- Single, four-stroke
- Gearbox
- 5-speed
- Dry weight
- 105.6 kg
- Seat height
- 955 mm
- Power
- 56.0 HP (41.2 kW)
What’s new for the 2025 Kawasaki KX 450SR
vs the 2024| Spec | 2024 | 2025 |
|---|---|---|
| Power | 44.9 HP (33.0 kW) | 56.0 HP (41.2 kW) |
| Wet weight | 110.2 kg (242.9 pounds) | 112.5 kg (248.0 pounds) |
| Front brakes | Single disc. Semi-floating petal discs. Dual piston. | Single disc. Dual pistons. |
| Rear brakes | Single disc. Petal disc. Single-piston caliper. | Single disc. Single-piston caliper. |
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Built purely for motocross racing and closed-course off-road riding, with a titanium race exhaust, traction/launch control and fully adjustable suspension aimed at podium performance.
- Built for
- A razor-sharp, high-revving single-cylinder race weapon that rewards aggressive input with explosive acceleration and pinpoint cornering agility on dirt.
- Not ideal for
- This bike is not suited for daily commuting, highway touring, passengers, or riders wanting comfort and low maintenance.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Will it fit you?
Worked out in your browser - nothing is sent to usEngine
- Capacity
- 449.0 ccm
- Power
- 56.0 HP (41.2 kW)
- Engine type
- Single, four-stroke
- Power/weight ratio
- 0.5303 HP/kg (dry)
- Bore x stroke
- 96.0 x 62.0 mm
- Compression
- 12.5:1
- Cooling system
- Liquid
- Fuel system
- Injection
- Starting
- Electric
- Ignition
- Digital CDI with 3 Coupler Options
Transmission
- Gearbox
- 5-speed
- Transmission type
- Manual
- Final drive
- Chain
- Clutch
- Wet multi-disc, manual
Dimensions & weight
- Wheelbase
- 1486 mm
- Overall length
- 2184 mm
- Overall width
- 820 mm
- Overall height
- 1270 mm
- Seat height
- 955 mm
- Dry weight
- 105.6 kg
- Wet weight
- 112.5 kg
- Fuel capacity
- 6.20 litres
- Ground clearance
- 340 mm
Chassis & suspension
- Frame
- Aluminum perimeter
- Front suspension
- 49mm inverted telescopic coil-spring fork with 16-way compression damping and 16-way rebound damping
- Rear suspension
- Uni-Trak® gas charged shock with piggyback reservoir with dual-range (4 turns stepless high speed/19-way low-speed) compression damping, 38-way rebound damping and adjustable preload
- Front wheel travel
- 305 mm
- Rear wheel travel
- 307 mm
- Rake (fork angle)
- 26.6°
- Trail
- 114 mm
Brakes & wheels
- Front brakes
- Single disc. Dual pistons.
- Front brakes diameter
- 270 mm
- Rear brakes
- Single disc. Single-piston caliper.
- Rear brakes diameter
- 240 mm
- Front tyre
- 80/100-21
- Rear tyre
- 120/80-19
Other
- Color options
- Lime Green
- Comments
- Smartphone connectivity. Traction control. Launch control. Power modes. Racing components. Special tuning.
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 | 2022 | 2023 | 2024 | 2025 | 2026 |
|---|---|---|---|---|---|
| Capacity | 449 cc | 449 cc | 449 cc | 449 cc | 449 cc |
| Dry weight | 106 kg | 106 kg | 106 kg | 106 kg | 106 kg |
| Seat height | 955 mm | 955 mm | 955 mm | 955 mm | 955 mm |
| Fuel capacity | 6.2 L | 6.2 L | 6.2 L | 6.2 L | 6.2 L |
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 450SR?
The 2025 Kawasaki KX 450SR has a Capacity of 449.0 ccm (27.40 cubic inches).
What engine power does the Kawasaki KX 450SR have?
The 2025 Kawasaki KX 450SR has a Power of 56.0 HP (41.2 kW).
How many gears does the Kawasaki KX 450SR have?
The 2025 Kawasaki KX 450SR has a Gearbox of 5-speed.
How much does the Kawasaki KX 450SR weigh?
The 2025 Kawasaki KX 450SR has a Dry weight of 105.6 kg (232.8 pounds).
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