The VIN number is certainly not correct, and it would appear that a digit is missing in the first 10 as the 10th digit would indicate the year and the "A" in the 10th digit of that number is not likely (1980?)
Like Chili said, checking to see that it is not stolen is difficult unless you have a contact at a law enforcement agency. I once tried to check a VIN number: I went to DMV and they told me that they couldn't run the number unless I was actually registering the vehicle. They referred me to the California Highway Patrol. CHP told me that they were not allowed to divulge any such information, privacy acts and such.
It seems odd to me that in this day of computer networks they can't put a database of stolen VINs online. Nothing that would provide any personal information, just a "GOOD / BAD" response.
I would doubt that there would be a lien against a dirt bike due to the fact that registration is not required in all states.
Rod