The 149.1cc fuel injected engine makes 13.1PS of power and 12.8Nm. Power drops on the new FZ FI and FZ-S from 14PS to 13.1PS while torque drops from 13.6Nm to 12.8Nm. The Blue Core, Yamaha claims, enables a quicker low down thrust and an increase of 14 per cent in fuel economy. The Yamaha FZ-S has improved breathing, combustion and exhaust to enhance efficiency and lower emissions(BS4 compliant). Yamaha says that the new FZ’s injectors need cleaning after every 6000km and the same interval applies for oil changes as well.