The R15S remains one potent small-capacity supersport for beginners.  The aggressive riding stance could cause discomfort if you intend to use the bike for daily commuting, and the quality of components has also gone down. The Yamaha R15S is powered by a 155 cc engine. The Yamaha R15S engine generates a power of 18.4 PS @ 10000 rpm and a torque of 14.2 Nm @ 7500 rpm.