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.
De Kawasaki KX450 (oorspronkelijk KX450F) werd in 2006 geïntroduceerd als een viertaktmotorcrossconcurrent, ter vervanging van de verouderde KX500 tweetaktmotor in de line-up van Kawasaki. In 2019 onderging het een ingrijpend herontwerp, met een elektrische start, een nieuw frame en herziene interne onderdelen van de motor, waarmee zijn reputatie als een motorcrossmachine van het hoogste niveau volgens fabrieksspecificaties werd verstevigd. De KX450 is naar meerdere AMA Supercross- en Motocross-kampioenschappen gereden, waardoor het een van de meest competitieve productiemotorcrossfietsen is die er zijn.
~55 hp
Kracht
~52 Nm
Koppel
110 kg
Gewicht
~145 km/h (estimated; gearing and terrain dependent — note: best estimate, not manufacturer-specified)
Topsnelheid
Estimated 6–9 L/100km (note: highly variable depending on riding intensity; off-road/motocross use is not standardized for fuel economy testing)
Brandstof
Naakt
Lichaam
Video Review
Wat kopers moeten weten
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.
Generaties en specificaties per jaar
Introductie van de KX450F met aluminium frame, 449cc vloeistofgekoelde viertakt, brandstofinjectie, voorganger met carburateur.
"Rauw wapen met aluminium frame dat de viertaktmotorcross herschreef."
Toen Kawasaki in 2006 de KX450F op de markt bracht, zei dat aluminium omtrekframe je meteen dat dit geen opgewarmde dreun was — het was een echte heroverweging. De 449 cc DOHC-motor trekt hard vanaf het middenbereik en ontploft absoluut tot meer dan 7.000 tpm, wat geweldig klinkt totdat je met je armen gepompt wordt op een krappe, ruige baan en hij probeert de eindjes van je af te wisselen. De vering — met name de Kayaba SSS voorvork — was voor die tijd echt toonaangevend in zijn klasse en nam meer vierkante slagen op dan de Honda CRF450R waarmee ik er rug aan rug mee reed. Eerlijk nadeel: de carburateur van de eerste generatie was van de fabriek af geschoten, waardoor er een vervelende platte plek aan de onderkant ontstond, en de gasrespons van de eerste generatie kon abrupt genoeg zijn om je halverwege de bocht uit te halen als je niet soepel reed.
Pluspunten
Nadelen
Herziene framegeometrie, nieuwe ophangingsinstellingen, vernieuwde cilinderkop en uitlaat voor een betere vermogensafgifte.
Nieuw aluminium frame, herziene interne onderdelen van de motor, toegevoegde elektrische starter, verbeterde ergonomie en bijgewerkte brandstofinjectie.
Herzien frame, bijgewerkte ophanging, nieuwe carrosserie, herziene motorindeling, introductie van de launch control.
Vingervolgventieltrein, nieuw frame, hydraulische koppeling, bijgewerkte brandstofinjectie, aanzienlijke gewichtsvermindering.
Nieuw chassis, vernieuwde ophanging, herziene carrosserie, tractiecontrole, verbeterde motorprestaties en elektronica.
Beoordeling van gebruikte kopers
"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.
Veel voorkomende problemen
🔥 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
✅Checklist vóór aankoop
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.
