In terms of raw performance, these two are evenly matched. The Vitpilen 401 and 390 Duke produce nearly identical power figures, meaning the real-world difference will come down to gearing and torque delivery rather than peak horsepower.
| Spec | Vitpilen 401 | 390 Duke |
|---|---|---|
| Displacement | 398.6 | 398.7 |
| Power | 45 | 44 |
| Cylinders | 1 | 1 |
| Weight | 0 | 165 |
| Seat height | 820 | 820 |