Kawasaki Vulcan S vs Yamaha Sirius FI

The Kawasaki Vulcan S (2026) 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 Vulcan S is a cruiser with 649 cc, 59.9 hp and unlisted weight; the Yamaha Sirius FI is a cub / underbone with 114 cc, 8.6 hp and 98 kg. Power-to-weight with the rider: 226.5 hp/ton versus 49.6 hp/ton. On this measure the Kawasaki Vulcan S is 357% ahead.

0-100 km/h (speedometer): Kawasaki Vulcan S 4.49 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 16.1 m for the Kawasaki Vulcan S (with ABS) and 18.5 m for the Yamaha Sirius FI (ABS unknown, class assumption: no ABS). The Kawasaki Vulcan S stops 2.4 m shorter. The standard 60-0 test is used because one calculated top speed is below 110 km/h. Calculated top speed: 173 km/h (estimated from power and drag) 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 Vulcan S and class-average calibration (no accepted model-specific road test) for the Yamaha Sirius FI. Missing manufacturer data (weight) is estimated by class regression, not measured. Open the interactive app (currently in Turkish) to watch the run side by side and change the load.