14 August. Friday 2026
Kawasaki KX450X - 2021 Specifications and Reviews
The 2021 Kawasaki KX450X is a competitive motocross bike designed for amateur and professional riders seeking a lightweight, agile machine. Its 449cc liquid-cooled four-stroke engine with DFI fuel injection delivers strong midrange power and predictable handling characteristics. Best known for excellent cornering stability and reliable performance across varied terrain, the KX450X remains a popular choice for cross-country and off-road competition.
General information | |
| Category | Cross / motocross |
| Year | 2021 |
| Model | Kawasaki KX450X |
| | |
Engine and Transmission Specifications | |
| Clutch | Wet multi-disc, manual |
| Transmission type | Chain (final drive) |
| Gearbox | 5-speed |
| Cooling system | Liquid |
| Ignition | Digital CDI with 3 Coupler Options |
| Fuel control | Double Overhead Cams/Twin Cam (DOHC) |
| Fuel system | Injection. DFI® with 44mm Keihin throttle body |
| Bore x Stroke | 96.0 x 62.0 mm (3.8 x 2.4 inches) |
| Compression | 12.5:1 |
| Engine type | Single cylinder, four-stroke |
| Capacity: | 449.0 ccm (27.40 cubic inches) |
Brakes, suspension, Frame and wheels | |
| Rear brakes | Single disc. Single-piston caliper. |
| Diameter | 270 mm (10.6 inches) |
| Front brakes | Single disc. Semi-floating petal discs |
| Rear tire | 120/80-18 |
| Front tire | 80/100-21 |
| Rear wheel travel | 307 mm (12.1 inches) |
| 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 (12.0 inches) |
| Front Suspension | 49mm inverted telescopic coil-spring fork with 16-way compression damping and 16-way rebound damping |
| Trail | 119 mm (4.7 inches) |
| Rake (fork angle) | 27.6° |
| Frame type | Aluminum perimeter |
Physical measures and capacities | |
| Fuel capacity | 6.20 litres (1.64 US gallons) |
| Wheelbase | 1485 mm (58.5 inches) |
| Ground clearance | 335 mm (13.2 inches) |
| Overall width | 820 mm (32.3 inches) |
| Overall length | 2185 mm (86.0 inches) |
| Overall height | 1265 mm (49.8 inches) |
| Seat height | 950 mm (37.4 inches) If adjustable, lowest setting. |
| Dry weight | 107.0 kg (235.8 pounds) |
| | |
Other specs | |
| Maintenance | Find parts, fluids, filters, maintenance tools and service items on eBay |
| Starter | Electric |
| Color options | Lime Green |
Performance Profile & Rider Fit
Best For
Track55%
City10%
Cornering70%
Daily Riding15%
Touring12%
Passenger5%
Rider Profile
| Best For | This is a competition-focused off-road machine best suited to intermediate and experienced dirt riders comfortable with a tall seat, aggressive suspension, and no electric start conveniences typical of the X cross-country variant. |
| Purpose | 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. |
| Rider Fit | The extremely low wet weight and tall 950 mm seat height demand a fit, physically capable rider with good leg length and the strength to manhandle the bike over rough terrain and technical obstacles. |
| Character | 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. |
Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.
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Rider Reviews
Total comments: 1
MotorcycleDB Review
The 2021 Kawasaki KX450X is an impressive off-road motorcycle that delivers power, agility, and durability. With its potent 449cc engine, lightweight chassis, and advanced suspension system, this bike is designed to tackle the toughest trails and terrains with ease. The refined ergonomics and adjustable footpegs ensure a comfortable and customizable riding experience for riders of all sizes. Additionally, the KX450X features a high-performance braking system and a rugged frame, making it a reliable and capable off-road companion. Overall, the 2021 Kawasaki KX450X is a top-tier off-road motorcycle that offers exceptional performance and versatility. Whether you're a weekend trail rider or a competitive racer, this bike has the power, handling, and durability to meet your off-road demands. With its advanced features and aggressive styling, the KX450X is a standout choice for anyone seeking an exhilarating and capable off-road experience.Add a Comment
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