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Kawasaki Z900 vs KTM 390 Duke

ESTIMATED SIMULATION

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The Kawasaki Z900 (2025) and the KTM 390 Duke (2025) are compared with the same Moto Kıyas physics model under identical conditions: flat dry asphalt, no wind, a 75 kg rider and no passenger. The Kawasaki Z900 is a naked bike with 948 cc, 122.0 hp and 213 kg; the KTM 390 Duke is a naked bike with 399 cc, 44.4 hp and 165 kg. Power-to-weight with the rider: 423.7 hp/ton versus 184.9 hp/ton. On this measure the Kawasaki Z900 is 129% ahead.

In the simulation the Kawasaki Z900 covers 0-100 km/h (speedometer) in 3.13 s and the KTM 390 Duke in 5.48 s; the Kawasaki Z900 is quicker by 2.35 s. In the 100-0 km/h brake test, braking distance without the 0.3 s reaction time is 43.7 m for the Kawasaki Z900 (with ABS) and 43.7 m for the KTM 390 Duke (with ABS). Calculated top speed: 234 km/h (manufacturer claim) versus 167 km/h (test measurement).

All values are an estimated simulation, not road-test measurements. Technical data comes from the sources listed below; the model uses model-specific parameters calibrated against published road tests for both. Open the interactive app (currently in Turkish) to watch the run side by side and change the load.

Estimated simulationKawasaki Z900KTM 390 Duke
Classnaked bikenaked bike
Engine948 cc399 cc
Power122.0 hp44.4 hp
Wet weight213 kg165 kg
Power-to-weight (75 kg rider)423.7 hp/ton184.9 hp/ton
0-100 km/h (speedometer)3.13 s5.48 s
100-0 km/h braking distance43.7 m43.7 m
Top speed (calc.)234 km/h167 km/h

Data sources and calibration

Specifications: the sources below (manufacturer pages, plus road-test or spec sites where the manufacturer gives no figure). Acceleration, braking and top speed: Moto Kıyas physics simulation (power/torque curve, gearing, drag, traction and wheelie limits, ABS assumption), calibrated against published road tests where available. Estimated, not measured.

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