Motocross Bikes
2023Kawasaki KX 450SR
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The 2023 Kawasaki KX 450SR is a competitive motocross machine designed for intermediate to advanced riders seeking professional-level performance. Powered by a liquid-cooled 449cc single-cylinder four-stroke engine with advanced fuel injection, it delivers strong acceleration and reliable power across the rpm range. The aluminum perimeter frame and precision engineering make it renowned for excellent handling and consistency on demanding track conditions.
- Capacity
- 449.0 ccm
- Engine
- Single, four-stroke
- Gearbox
- 5-speed
- Dry weight
- 105.6 kg
- Seat height
- 955 mm
- Power
- 44.9 HP (33.0 kW)
What’s new for the 2023 Kawasaki KX 450SR
vs the 2022| Spec | 2022 | 2023 |
|---|---|---|
| Power | 56.0 HP (41.2 kW) | 44.9 HP (33.0 kW) |
| Front suspension | KYB 49mm inverted telescopic coil-spring fork with 16-way compression damping and 16-way rebound damping | 49mm inverted telescopic coil-spring fork with 16-way compression damping and 16-way rebound damping |
| Rear suspension | KYB 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 | 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 brakes | Single disc. Semi-floating petal discs | Single disc. Semi-floating petal discs. Dual piston. |
| Rear brakes | Single disc. Single-piston caliper. | Single disc. Petal disc. Single-piston caliper. |
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Built purely for closed-course motocross racing, not for street use or general recreation.
- Built for
- A race-ready, high-strung single-cylinder motocrosser that rewards aggressive riding with sharp handling and huge suspension travel.
- Not ideal for
- Not suitable for beginners, commuting, passengers, or anyone wanting road-legal or touring capability.
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
- 44.9 HP (33.0 kW)
- Engine type
- Single, four-stroke
- Power/weight ratio
- 0.4252 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
- 1485 mm
- Overall length
- 2185 mm
- Overall width
- 820 mm
- Overall height
- 1265 mm
- Seat height
- 955 mm
- Dry weight
- 105.6 kg
- Wet weight
- 110.2 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
- 315 mm
- Rear wheel travel
- 307 mm
- Rake (fork angle)
- 27.6°
- Trail
- 122 mm
Brakes & wheels
- Front brakes
- Single disc. Semi-floating petal discs. Dual piston.
- Front brakes diameter
- 270 mm
- Rear brakes
- Single disc. Petal disc. Single-piston caliper.
- Front tyre
- 80/100-21
- Rear tyre
- 120/80-19
Other
- Color options
- Lime Green
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 2023 Kawasaki KX 450SR has a Capacity of 449.0 ccm (27.40 cubic inches).
What engine power does the Kawasaki KX 450SR have?
The 2023 Kawasaki KX 450SR has a Power of 44.9 HP (33.0 kW).
How many gears does the Kawasaki KX 450SR have?
The 2023 Kawasaki KX 450SR has a Gearbox of 5-speed.
How much does the Kawasaki KX 450SR weigh?
The 2023 Kawasaki KX 450SR has a Dry weight of 105.6 kg (232.8 pounds).
Shop this bike
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The 2023 Kawasaki KX 450SR is a powerful and versatile off-road motorcycle that delivers top-notch performance. With its 449cc engine, lightweight chassis, and advanced suspension system, this bike is built for tackling the toughest terrains with ease. The ergonomic design and adjustable handlebars make for a comfortable ride, while the responsive braking system ensures safety in all conditions. Whether you're an experienced rider looking for a high-performance machine or a beginner looking to step up your game, the KX 450SR is a top choice for off-road enthusiasts.
In addition to its impressive performance, the 2023 Kawasaki KX 450SR also stands out for its sleek and modern design. The bold graphics and aggressive styling make a statement on the track, while the durable construction ensures long-lasting quality. With advanced features like launch control and adjustable engine mapping, this bike offers a customizable experience to suit your riding style. Overall, the KX 450SR is a standout option for riders looking for a capable and reliable off-road motorcycle that delivers both power and style.
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