no need to spend a fortune as it wont make a whole lot of difference , it after all is a 125 with a Suzuki gs engine . I have a 13 reg one which im very happy with but a 4 stroke should never rev to max all the time so all I will do is put a 16t sprocket on the front and a 38t on the back as this will still do 60 but at lower revs so saving the engine . if you want more power or speed , get a bigger bike.
Noddy
March 2014