Yamaha Sirius FI vs Yamaha XMAX 250

The Yamaha Sirius FI (2025) and the Yamaha XMAX 250 (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 Yamaha Sirius FI is a cub / underbone with 114 cc, 8.6 hp and 98 kg; the Yamaha XMAX 250 is a scooter with 250 cc, 22.4 hp and 183 kg. Power-to-weight with the rider: 49.6 hp/ton versus 86.8 hp/ton. On this measure the Yamaha XMAX 250 is 75% ahead.

0-100 km/h (speedometer): Yamaha Sirius FI not reached (top simulated speed 89 km/h), Yamaha XMAX 250 11.65 s. In the 60-0 km/h brake test, braking distance without the 0.3 s reaction time is 18.5 m for the Yamaha Sirius FI (ABS unknown, class assumption: no ABS) and 16.3 m for the Yamaha XMAX 250 (with ABS). The Yamaha XMAX 250 stops 2.2 m shorter. The standard 60-0 test is used because one calculated top speed is below 110 km/h. Calculated top speed: 88 km/h (estimated from power and drag) versus 126 km/h (GPS measurement).

All values are an estimated simulation, not road-test measurements. Technical data comes from the sources listed below; the model uses class-average calibration (no accepted model-specific road test) for the Yamaha Sirius FI and model-specific parameters calibrated against published road tests for the Yamaha XMAX 250. Open the interactive app (currently in Turkish) to watch the run side by side and change the load.