Hi Friends, Confortable installed at the wheel of my car driving on Phetkasem between Bangkok and Hua Hin, I am often passed by mopeds ridden by teens runing at more than 130/140 Km/h ??? !!! These bikes are supposed to be 125 or 150 cc. but what is their secret(s) I really wonder ? Could someone explain me a bit more the modifications they do on their mopeds ? -Exhaust ? -Air filter ? -Thin wheels ? -Carb ? I have difficulties to imagine these teens spending crazy money in cost full big bore conversion kits ? What would be the trick ? Thanks for your help to make me understand, I am quite perplex on it. Keep on the Power !