I have a 2005 C50 and i would like to change the gear ratio on it the gears to me are to low. I think that i get way to much vibration at 65mph and the fuel milage goes down compared to the 50 mpg around town. I have rode bikes my whole life and this is the only one that i can start out in 5th gear. If you know any way of changing the ratio please let me know thanks.