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Yamaha Yz450f

Kawasaki Kx 450

Type
Motocross
Motocross
Horsepower
Approximately 60–63 hp @ 9,500 rpm (varies by model year; 2020+ models produce near the upper end)
~55 hp @ 9,000 rpm (estimated; Kawasaki does not officially publish power figures — note: dyno results typically range 53–58 hp)
Torque
Approximately 53–55 Nm @ 8,000 rpm (estimate; Yamaha does not officially publish torque figures for this model)
~52 Nm @ 7,500 rpm (estimated; official figures not published — note: best estimate based on dyno data)
Top Speed
Approximately 145–155 km/h (estimate based on dyno and track testing; not an officially published figure)
~145 km/h (estimated; gearing and terrain dependent — note: best estimate, not manufacturer-specified)
Weight
110 kg (curb/wet weight, approximate for 2018–2023 models; earlier models slightly heavier)
110 kg (curb weight, 2023 model)
Fuel
Estimated 6–8 L/100km under typical motocross/off-road use (note: highly variable depending on riding intensity; no official road consumption figure exists for this competition-focused bike)
Estimated 6–9 L/100km (note: highly variable depending on riding intensity; off-road/motocross use is not standardized for fuel economy testing)
Fairing
No
No
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