Kawasaki KX450 X
- Production years
- 2019–2027
- Brand
- Kawasaki
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KAWASAKI KX450 (2025-Present)
Selected year: 2027
Technical specifications
- Engine capacity
- 449 cm³
- Power
- 56 hp (42 kW)
- Wet weight
- 112.6 kg
- Seat height
- 960 mm
Overview
The Kawasaki KX450 X is a motocross bike in the KX450 family, produced from 2019 through 2027. For 2027, it has a 449.0 cm³ liquid-cooled, fuel-injected four-stroke single producing 56 hp (42 kW); it weighs 107.0 kg dry and 112.6 kg wet.
A 960 mm seat and 345 mm ground clearance give it a tall stance, while its 112.6 kg wet weight is relevant when maneuvering at low speed. The front fork and Uni-Trak® rear shock offer extensive damping and preload adjustment, with 305 mm of front travel and 307 mm at the rear for absorbing rough terrain; electric starting avoids the need for a kick-start routine.
Specifications
Engine
Engine
- Bore x stroke
- 96.0 x 62.1 mm
- Engine capacity
- 449 cm³
- Compression ratio
- 12.5:1
- Cooling system
- Liquid
- Engine type
- Single, four-stroke
- Fuel system
- Injection
- Ignition
- Digital DC-CDI
- Lubrication system
- Forced lubrication, semi-dry sump
- Starting
- Electric
Performance and transmission
Performance and transmission
- Power
- 56 hp (42 kW)
- Power weight ratio
- 0.5234 HP/kg (dry)
- Clutch
- Wet multi-disc, manual
- Final drive
- Chain
- Gearbox
- Manual 5-speed
- Transmission type
- Manual
Dimensions and weight
Dimensions and weight
- Dry weight
- 107 kg
- Fuel capacity
- 6.2 L
- Ground clearance
- 345 mm
- Overall height
- 1,270 mm
- Overall length
- 2,180 mm
- Overall width
- 820 mm
- Seat height
- 960 mm
- Wet weight
- 112.6 kg
- Wheelbase
- 1,480 mm
Chassis and suspension
Chassis and suspension
- Frame
- Perimeter, aluminum
- Front suspension
- 49mm inverted telescopic coil-spring fork with 16-way compression damping and 16-way rebound damping
- Front wheel travel
- 305 mm
- Rake
- 27.6°
- 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
- Rear wheel travel
- 307 mm
- Trail
- 115 mm
Brakes and wheels
Brakes and wheels
- Front brakes
- Single disc. Semi-floating petal discs
- Front brakes diameter
- 270 mm
- Front tyre
- 80/100-21 51M
- Rear brakes
- Single disc. Single-piston caliper.
- Rear tyre
- 120/80-19 63M
Model years
2023
Wet weight: 110 kg → 109.9 kg
2024
Wet weight: 109.9 kg → 111.6 kg; Seat height: 955 mm → 950 mm
2025
Wet weight: 111.6 kg → 112.6 kg; Seat height: 950 mm → 960 mm
| Specification | ||||||
|---|---|---|---|---|---|---|
| Engine capacity | 449 cm³ | 449 cm³ | 449 cm³ | 449 cm³ | 449 cm³ | 449 cm³ |
| Power | 56 hp (42 kW) | 56 hp (42 kW) | 56 hp (42 kW) | 56 hp (42 kW) | 56 hp (42 kW) | 56 hp (42 kW) |
| Wet weight | 110 kg | 109.9 kg | 111.6 kg | 112.6 kg | 112.6 kg | 112.6 kg |
| Seat height | 955 mm | 955 mm | 950 mm | 960 mm | 960 mm | 960 mm |
| Fuel capacity | 6.2 L | 6.2 L | 6.2 L | 6.2 L | 6.2 L | 6.2 L |
Pros and cons
Advantages
Highly adjustable suspension
The fork and rear shock both allow damping adjustments, and the rear shock also has adjustable preload to tune the setup.
Long suspension travel
With 305 mm of front travel and 307 mm at the rear, the suspension has room to absorb substantial bumps.
Electric starting
The electric starter makes starting straightforward without relying on a kick starter.
Things to consider
Tall seat
At 960 mm, the seat can make it difficult for shorter riders to get a foot down at a stop.
Chain final drive
The chain needs regular cleaning and adjustment.
6.20-liter fuel capacity
The tank holds 6.20 liters, limiting how much fuel can be carried before a refill.
Rider fit
Rider fit calculator
Calculated in your browser
Don't know it? Leave this empty and we'll estimate it from your height.
Estimated from your height: 79 cm
How to measure
Stand barefoot with your back to a wall. Hold a book firmly between your legs, then measure from the floor to the top edge of the book.
Estimated ground reach
Ground reach may be difficult
This seat may feel tall. A lower seat or suspension setup could make stops easier.
Seat height
960 mm
Approx. loaded height
930 mm
Estimate assumes about 30 mm of suspension sag. Seat width, footwear, luggage and suspension settings can change real reach. Always sit on the motorcycle before buying.
Fuel range calculator
Enter your expected fuel consumption to estimate the distance on a full tank, with or without a fuel reserve.
Tank 6.2 L at 6 L/100 km
Lower consumption = longer range.
Estimated range
103 km
With 10% reserve
93 km
This is a planning estimate, not a measured result. Speed, route, weather, load and riding style can change real consumption.
FAQ
What is the engine size of the 2027 Kawasaki KX450 X?
It has a 449.0 cm³ liquid-cooled, four-stroke single-cylinder engine.
How much power does the 2027 Kawasaki KX450 X make?
It produces 56 hp (42 kW).
What is the seat height of the 2027 Kawasaki KX450 X?
Its seat height is 960 mm.
Is the suspension adjustable on the 2027 Kawasaki KX450 X?
Yes, the fork has compression and rebound damping adjustment, while the rear shock adds adjustable compression damping, rebound damping, and preload.
