winkie

Hi everyone, I got my first bike today and really cracking one in perfect condition and only done 10k. The bike is a 1999 Yamaha SR 125 and I am going to use it to pass my test. I rode round today and i think it may be restricted, got up to about 55mph and it doesn't really pull that well, which is why i think it is restricted, its' runs perfectly. Does anybody know if this is restricted and can it be de-restricted and how much of a job it is ? Cheers Steve