I have changed the motor to 120r, does anyone know if it's just a matter of filling out the form to change the engine number on registration or does the bike have to go over pits?

Dingo I just changed my engine number when I fitted my 120R pretty simple, from memory it cost zero dollars

Thanks ando, I was hoping that was the case.

Just thinking about that boys... Don't the newer bikes have the engine number stamped on the frame?

no mongrel thats the vin/frame number sometimes almost the same as the engine number

Hmmm I will check mine out when I get home, but I am sure both numbers on the engine and frame are identical.

So I have just checked and the number on the sticker is stamped into the frame and etched into the engine!! I told ya they all matched!!