cesko

Hello I m new here and i come from Slovenia so sorry for my very bad english . I have yamaha yzf r 125 too and is great bike. But i have one question. My max speed on this yamaha is 115 km/h or 72 mph. Is this normal? Because the other yzf r 125 owners said that they reached 125 km/h or 78 mph easly and everytime. Is maybe my yamaha restricted? And how i derestricted my yamaha? Thank you