What shall i do with my CH-Racing WSM 125?

[CH-Racing_WSM_125]

Hello!
I live in Sweden so i have to take this in english. I have an Ch-racing 125cc and its so slow.=( It goes around 90km/h and what shall i do to make it go better? If you now any tuning page or so? Have a nice day! And excuse my bad english!
/Benny