The engine is like the heart to a motor as well as the source of energy needed for riding. That the sense of riding is determined by the engine is not a exaggerated saying.
Motors of small displacement(under 250CC) can run freely and let the rider enjoy the sense of easy control due to the full use of their lightweight and simplified body. Though they can't match motors of big displacemnt in PWR, motors of small displacement can brake faster because of their lighter weight and shorter brake distance, thus they perform better in turning speed.