Kawasaki Kx 450
The Kawasaki KX450 (originally KX450F) was introduced in 2006 as a four-stroke motocross competitor, replacing the aging KX500 two-stroke in Kawasaki's lineup. It underwent a major redesign in 2019, featuring an electric start, a new frame, and revised engine internals, solidifying its reputation as a top-tier factory-spec motocross machine. The KX450 has been ridden to multiple AMA Supercross and Motocross championships, making it one of the most competitive production motocross bikes available.
~55 hp
Power
~52 Nm
Torque
110 kg
Weight
~145 km/h (estimated; gearing and terrain dependent — note: best estimate, not manufacturer-specified)
Top Speed
Estimated 6–9 L/100km (note: highly variable depending on riding intensity; off-road/motocross use is not standardized for fuel economy testing)
Fuel
Naked
Body
What Buyers Should Know
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.
Full Specifications
Rivals & Alternatives
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