The KTM Duke 350’s engine is the better one overall if you care about sharper performance, while the NS400Z engine is the stronger value pick because it gives very close output for less money. The latest 2026 figures show the Duke 350 at 41.5 hp and 33.5 Nm, versus the NS400Z at 40 hp and 33.2 Nm.

Engine feel

The Duke 350 should feel a bit more lively and responsive at the top end, with slightly higher power and torque. The NS400Z is very close on paper, but it is tuned a little softer after the 2026 update.

Which is better

  • Choose Duke 350 if you want the more polished performance engine and a sportier riding feel.
  • Choose NS400Z if you want nearly similar output with a lower price and better overall value.

Simple verdict

For engine quality/performance , Duke 350 wins by a small margin. For smart buying , NS400Z makes more sense.

TL;DR: Duke 350 is the better engine; NS400Z is the better deal.