Hi newbie here just got my self a wee 06 model kinlon 125 gy and am loving it but looking for advice .....

Does anyone know if ther is a restrictor in these bikes or are they just slow in general. It seems to vibrate and feel restricted when tryin g to get up up the rev range and really struggles to get 100kph (60mph) I am a mechanic to trade but to save me ripping it apart in search of a restrictor I was wondering if anyone one was in the know
Cheers in advance
Lee