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.
A Kawasaki KX450 (originalmente KX450F) foi introduzida em 2006 como uma competidora de motocross de quatro tempos, substituindo a antiga KX500 de dois tempos na linha da Kawasaki. Ela passou por uma grande reformulação em 2019, com partida elétrica, nova estrutura e motor interno revisado, solidificando sua reputação como uma máquina de motocross de primeira linha com especificações de fábrica. A KX450 já participou de vários campeonatos AMA de Supercross e Motocross, tornando-a uma das motos de motocross de produção mais competitivas disponíveis.
~55 hp
Poder
~52 Nm
Torque
110 kg
Peso
~145 km/h (estimated; gearing and terrain dependent — note: best estimate, not manufacturer-specified)
Velocidade máxima
Estimated 6–9 L/100km (note: highly variable depending on riding intensity; off-road/motocross use is not standardized for fuel economy testing)
Combustível
Nua
Corpo
Video Review
O que os compradores devem 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.
Gerações e especificações por ano
Apresentou o KX450F com estrutura de alumínio, 449 cc refrigerado a líquido a quatro tempos, configuração de carburador predecessor com injeção de combustível.
"Arma bruta com estrutura de alumínio que reescreveu o motocross de quatro tempos."
Quando a Kawasaki lançou o KX450F em 2006, essa estrutura perimetral de alumínio imediatamente lhe disse que não era um pára-choque aquecido — era uma verdadeira reformulação. O motor DOHC de 449 cc sai da faixa média e detona totalmente a mais de 7.000 rpm, o que soa bem até que você seja empurrado com o braço em uma pista apertada e esburacada e ele tente trocar as pontas de você. A suspensão — especialmente o garfo Kayaba SSS — foi genuinamente líder de classe na época, absorvendo melhor os impactos de arestas quadradas do que a Honda CRF450R que eu pilotava consecutivamente com ela. Uma desvantagem honesta: o carboidrato das primeiras unidades foi retirado da fábrica, causando uma forte mancha plana na parte inferior, e a resposta do acelerador de primeira geração poderia ser abrupta o suficiente para pegá-lo no meio da curva se você não estivesse suave.
Prós
Contras
Geometria revisada do chassi, novas configurações de suspensão, cabeçote do cilindro e escape atualizados para melhor fornecimento de potência.
Nova estrutura de alumínio, componentes internos do motor revisados, partida elétrica adicionada, ergonomia aprimorada e injeção de combustível atualizada.
Quadro revisado, suspensão atualizada, nova carroceria, mapeamento revisado do motor e introdução do controle de lançamento.
Trem de válvulas seguidoras de dedos, nova estrutura, embreagem hidráulica, injeção de combustível atualizada, redução significativa de peso.
Novo chassi, articulação de suspensão atualizada, carroceria revisada, controle de tração, desempenho aprimorado do motor e eletrônica.
Avaliação do 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 comuns
🔥 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 verificação de pré-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.
