loopy

Hi i am looking for any help in trying to identify my Dt 125 i have an engine number and a frame number but i dont know how to find out what model it is?? I dont have any paperwork as i brought it at a stolen recovered auction and Yamaha dont seem to be able to help me!!! I seem to have a very strange Vin number on this bike which is not helping in identifing it i have been looking into the whole vin number thing and it says they should be 17 digits long but the one i have is only 11 digits and there is not any missing thats all there is and no signs of anything being rubbed off?!?!?!?!