Yamaha Sirius FI vs Yuki Hammer 125

The Yamaha Sirius FI (2025) and the Yuki Hammer 125 (2026) 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 Yuki Hammer 125 is a naked bike with 124 cc, 9.1 hp and unlisted weight. Power-to-weight with the rider: 49.6 hp/ton versus 47.6 hp/ton. On this measure the Yamaha Sirius FI is 4% ahead.

0-100 km/h (speedometer): Yamaha Sirius FI not reached (top simulated speed 89 km/h), Yuki Hammer 125 not reached (top simulated speed 69 km/h). 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 17.3 m for the Yuki Hammer 125 (ABS unknown, class assumption: no ABS). The Yuki Hammer 125 stops 1.2 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 83 km/h (manufacturer claim).

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 both. Open the interactive app (currently in Turkish) to watch the run side by side and change the load.