I am driving my yamaha since 2007, Still now there is no engine problems. Main thing I want to tell about is the riding quality. Gladiator is the best bike in 125cc segment when compared with discover, shine, glamour. It is giving me around 58km/litre mileage till date. Main problem with the gladiator is the Battery and service. But the smoother kick rod made me not to purchase any battery.
Over all its a good bike. Yamaha lovers go ahead and buy it.