2024Kawasaki KX450X

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The 2024 Kawasaki KX450X is a competition-focused motocross machine designed for serious off-road racers and high-level amateur riders. Powered by a liquid-cooled 449cc single-cylinder four-stroke engine with advanced DFI fuel injection and DOHC technology, it delivers responsive performance across varied terrain. Best known for its aggressive handling characteristics and reliable five-speed transmission, the KX450X excels in competitive motocross environments.

Capacity: 449.0 ccm
Engine: Single, four-stroke
Gearbox: 5-speed
Dry weight: 107.0 kg
Seat height: 950 mm
Power: 56.0 HP (41.2 kW)

⇄ Compare with another bike All model years

Other years 2021 2022 2023 2024 2025 2026 2027

How it rides

Editorial estimate from the spec sheet - not lab tested

Off-road & trail96%

Cornering70%

City riding10%

Daily riding15%

Touring12%

Two-up5%

Track55%

Best for: Built specifically for cross-country and off-road racing, with a wide-ratio gearbox, larger fuel capacity, and chassis geometry tuned for extended off-road stability rather than motocross jumps or street use.
Built for: It has the raw, high-strung, minimalist character of a purpose-built race bike: light, responsive, and demanding rather than forgiving.
Not ideal for: This is not a suitable choice for commuting, highway touring, carrying a passenger, or riders seeking plush comfort and low-maintenance road-going practicality.

Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.

Will it fit you?

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Your height

Inseam (optional)

Units

At 950mm, a rider of 175cm with a 79cm (estimated) inseam will not reach the ground comfortably on the 2024 Kawasaki KX450X, with a cramped knee angle of around 85 degrees and an upright riding position.

Assumes about 30mm of suspension sag once seated. This is an approximation from category-typical geometry, not a measurement of this bike or of you - sit on one before you buy.

More bikes at over 900 mm — Sky High →

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Full specifications

Engine

Capacity: 449.0 ccm
Power: 56.0 HP (41.2 kW)
Engine type: Single, four-stroke
Power/weight ratio: 0.5234 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
Lubrication system: Forced lubrication, semi-dry sump

Transmission

Gearbox: 5-speed
Transmission type: Manual
Clutch: Wet multi-disc manual clutch and hydraulic clutch actuation

Dimensions & weight

Wheelbase: 1485 mm
Overall length: 2185 mm
Overall width: 820 mm
Overall height: 1265 mm
Seat height: 950 mm
Dry weight: 107.0 kg
Wet weight: 111.6 kg
Fuel capacity: 6.20 litres
Ground clearance: 335 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): 27.6°
Trail: 119 mm

Brakes & wheels

Front brakes: Single disc. Semi-floating petal discs
Front brakes diameter: 270 mm
Rear brakes: Single disc. Single-piston caliper.
Front tyre: 80/100-21
Rear tyre: 120/80-18

Other

Color options: Lime Green
Comments: Launch Control.

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	2021	2023	2024	2026	2027
Capacity	449 cc	449 cc	449 cc	449 cc	449 cc
Dry weight	107 kg	107 kg	107 kg	107 kg	—
Seat height	950 mm	950 mm	950 mm	950 mm	—
Fuel capacity	6.2 L	6.2 L	6.2 L	6.2 L	7.5 L