Among all other Yamaha lineups, the YZF-R series -- in which R stands for Race ... its 599cc engine producing 125 hp felt underwhelming, especially in the low and mid-range.

its aggressive new face oozes pure R-Series DNA.For strong performance at all speeds the 125cc 4-stroke engine is equipped with Yamaha’s power-boosting Variable Valve Actuation (VVA) technology ...