Salman Sahab, if you have bought a new one and its running is about to get completed or have completed recently, please have patience. New engines dont reverb to their max speeds at initial levels. Once your bike will cross 5K mark and if will be well tuned at that time, it will surely give you 120km/hr.
In addition to this, after crossing 5k mark its fuel efficiency will also improve therefore no need to twist the throttle of a new bike every now and then for checking its max speed, ride safely with the decent pattern of gear shift and let the engine reverb on its own according to the RPM you attain by twisting the throttle.
Enjoy riding safe.