I have a low hour 450 sx-f dungy edition. Case never been opened. Is it normal that it vibrates? I can ride about a 10 min moto befor my forearms go numb from the vibration. My older yami never vibrated this much. Neither does my fathers kawi.... is there a way to balance the motor to cut down this vibration? Anyone have an idea on prices to get it balanced? Im in socal thank you much ahead of time!