Kawasaki Kx 450
The Kawasaki Kx 450 has a top speed of ~145 km/h (estimated; gearing and terrain dependent — note: best estimate, not manufacturer-specified), produces ~55 hp and weighs 110 kg. Motoryk rates it 8.5/10.
La Kawasaki KX450 (originalmente KX450F) se presentó en 2006 como competidora de motocross de cuatro tiempos, sustituyendo a la antigua KX500 de dos tiempos de la gama de Kawasaki. Se sometió a un importante rediseño en 2019, con un arranque eléctrico, un nuevo cuadro y una parte interna del motor revisada, lo que consolidó su reputación como una máquina de motocross de primer nivel con especificaciones de fábrica. La KX450 ha participado en varios campeonatos de Supercross y Motocross de la AMA, lo que la convierte en una de las motos de motocross de producción más competitivas del mercado.
~55 hp
Potencia
~52 Nm
Torsión
110 kg
Peso
~145 km/h (estimated; gearing and terrain dependent — note: best estimate, not manufacturer-specified)
Velocidad máxima
Estimated 6–9 L/100km (note: highly variable depending on riding intensity; off-road/motocross use is not standardized for fuel economy testing)
Combustible
Desnudo
Cuerpo
Video Review
Lo que los compradores deben saber
Launch Control System
The KX450 features a built-in launch control mode that limits power delivery for optimal holeshots — a feature typically found only on higher-end or heavily modified bikes.
Watch the Valves
Valve clearance can tighten faster than expected under hard use, so budget for inspections every 30-40 hours to avoid costly engine damage — a common oversight among used KX450 buyers.
Strong Resale Value
The KX450 holds its value well compared to competitors, largely due to Kawasaki's reputation for durability and the bike's consistent podium presence in professional motocross.
Generaciones y especificaciones por año
Presentó el KX450F con marco de aluminio, cuatro tiempos, cuatro tiempos, refrigeración líquida, configuración de carburador predecesor con inyección de combustible.
"Arma bruta con marco de aluminio que reescribió el motocross de cuatro tiempos."
Cuando Kawasaki lanzó la KX450F en 2006, el marco perimetral de aluminio inmediatamente demostró que no se trataba de un golpe exagerado, sino de un auténtico replanteamiento. El motor DOHC de 449 cc tira con fuerza desde la gama media y detona por completo a más de 7.000 rpm, lo que suena muy bien hasta que estás en una pista cerrada y llena de baches e intenta cambiar de dirección. La suspensión, especialmente la horquilla Kayaba SSS, era realmente la mejor de su clase para la época, ya que absorbía los golpes de filo cuadrado mejor que la Honda CRF450R que la conducía de forma consecutiva. Una desventaja honesta: el carburador de las primeras unidades venía de fábrica, lo que provocaba una mala mancha plana en la parte inferior, y la respuesta del acelerador de primera generación podía ser lo suficientemente brusca como para atraparte en mitad de la curva si no eras suave.
Pros
Contras
Geometría del chasis revisada, nuevos ajustes de suspensión, culata y escape actualizados para mejorar la entrega de potencia.
Nuevo marco de aluminio, componentes internos del motor revisados, arranque eléctrico agregado, ergonomía mejorada e inyección de combustible actualizada.
Chasis revisado, suspensión actualizada, carrocería nueva, mapeo del motor revisado, control de lanzamiento introducido.
Tren de válvulas que siguen los dedos, marco nuevo, embrague hidráulico, inyección de combustible actualizada y reducción de peso significativa.
Chasis nuevo, varillaje de suspensión actualizado, carrocería revisada, control de tracción, rendimiento del motor y electrónica mejorados.
Reseña de un comprador usado
"A brilliant 450 that rewards experienced riders who buy smart."
$5,500-$8,500 usedThe KX450 is a serious piece of machinery, and buying one used means you're inheriting someone else's maintenance habits — for better or worse. These engines are built tough, but they're also built to be flogged hard, so the first thing you're checking is service history. Valve clearances, hour meters, whether the air filter's been swapped regularly. A neglected KX450 will bite you financially before it bites you on the track. Get a good one, though, and you've got one of the sharpest-handling 450s on the market. The power delivery is explosive but manageable once you're comfortable with it — not the friendliest bike for intermediate riders stepping up in class. The suspension is legitimately excellent stock, which saves you money compared to competitors that need immediate respringing. Kawasaki's launch control and traction management systems on newer models are genuinely useful, not just marketing fluff. Price is fair in the used market right now. Just budget for consumables — chains, sprockets, and brake pads disappear fast on a bike that gets ridden the way this one deserves.
Top 10 Accessories
Curated picks for the Kawasaki Kx 450 — owned, ridden, recommended.
Problemas comunes
🔥 1 CRITICALCompression test, inspect for smoke or rattling noise
Cold start behavior, ask when valves last checked
Grab rear wheel, check for play and clunking
✅Lista de verificación previa a la compra
Reliable if maintained, high risk when neglected
Full Specifications
Rivals & Alternatives
Bikes that buyers cross-shop with the Kawasaki Kx 450
Ktm Sx 450
Ktm Sx-f 450
Suzuki Rm-z 450
Yamaha Yz450f
Suzuki Rmz450
Compare Kawasaki Kx 450 Side-by-Side
compare_arrowsSpecs, power, weight & buyer verdict — head-to-head with the bikes most often cross-shopped.
Kawasaki Kx 450 vs Ktm Sx 450
Specs · Power · Buyer verdict
Kawasaki Kx 450 vs Ktm Sx-f 450
Specs · Power · Buyer verdict
Kawasaki Kx 450 vs Suzuki Rm-z 450
Specs · Power · Buyer verdict
Kawasaki Kx 450 vs Yamaha Yz450f
Specs · Power · Buyer verdict
Kawasaki Kx 450 vs Suzuki Rmz450
Specs · Power · Buyer verdict
More Kawasaki Kx 450 Guides
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Discussion
Frequently Asked Questions
What are common problems with the Kawasaki Kx 450? +
Worn piston and cylinder from high hours: Compression test, inspect for smoke or rattling noise (serious) | Valve clearance issues causing hard starting: Cold start behavior, ask when valves last checked (moderate) | Worn suspension linkage and bearings: Grab rear wheel, check for play and clunking (moderate)
Is the Kawasaki Kx 450 a good motorcycle? +
A brilliant 450 that rewards experienced riders who buy smart. Rating: 8.5/10. Best for: Experienced motocross riders ready for serious competition. Avoid if: Intermediate riders still building fundamental skills.
What is the horsepower of the Kawasaki Kx 450? +
The Kawasaki Kx 450 produces ~55 hp @ 9,000 rpm (estimated; Kawasaki does not officially publish power figures — note: dyno results typically range 53–58 hp), with ~52 Nm @ 7,500 rpm (estimated; official figures not published — note: best estimate based on dyno data) of torque. Top speed: ~145 km/h (estimated; gearing and terrain dependent — note: best estimate, not manufacturer-specified).
Is the Kawasaki Kx 450 good for beginners? +
Not really — the Kawasaki Kx 450 is better for experienced riders. Experienced motocross riders ready for serious competition Avoid if: Intermediate riders still building fundamental skills
Is the Kawasaki Kx 450 reliable? +
Owners report 1 critical issue to watch for on the Kawasaki Kx 450, notably: Worn piston and cylinder from high hours (Compression test, inspect for smoke or rattling noise). Buy with a pre-purchase inspection.
Is the Kawasaki Kx 450 good for daily use? +
Experienced motocross riders ready for serious competition Fuel: Estimated 6–9 L/100km (note: highly variable depending on riding intensity; off-road/motocross use is not standardized for fuel economy testing).
How fast is the Kawasaki Kx 450? +
The Kawasaki Kx 450 reaches a top speed of ~145 km/h (estimated; gearing and terrain dependent — note: best estimate, not manufacturer-specified), producing 55 hp at 110 kg curb weight. Real-world performance depends on rider weight, gearing, and road conditions.
What gear should I buy for a Kawasaki Kx 450? +
Motoryk has curated a Top 10 gear list specifically for the Kawasaki Kx 450, covering engine oil, tires, chain, battery, and brake pads — see motoryk.com/bikes/kawasaki/kx-450/top10. Each pick is matched to this bike's spec.
