Kawasaki Z900 vs Yamaha Sirius FI

The Kawasaki Z900 (2025) and the Yamaha Sirius FI (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 Yamaha Sirius FI is a cub / underbone with 114 cc, 8.6 hp and 98 kg. Power-to-weight with the rider: 423.7 hp/ton versus 49.6 hp/ton. On this measure the Kawasaki Z900 is 754% ahead.

0-100 km/h (speedometer): Kawasaki Z900 3.13 s, Yamaha Sirius FI not reached (top simulated speed 89 km/h). In the 60-0 km/h brake test, braking distance without the 0.3 s reaction time is 15.7 m for the Kawasaki Z900 (with ABS) and 18.5 m for the Yamaha Sirius FI (ABS unknown, class assumption: no ABS). The Kawasaki Z900 stops 2.8 m shorter. The standard 60-0 test is used because one calculated top speed is below 110 km/h. Calculated top speed: 234 km/h (manufacturer claim) versus 88 km/h (estimated from power and drag).

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 the Kawasaki Z900 and class-average calibration (no accepted model-specific road test) for the Yamaha Sirius FI. Open the interactive app (currently in Turkish) to watch the run side by side and change the load.