Well, good luck to you, I am sure you now know why it is not such a good idea to buy any type of vehicle without a title. The DMV should be able to help you figure out if it is stolen or not, here in WA, we would need to take it to a State Patrol inspection center, they won't tell you anything about it here if it isn't there for them to confiscate if it does turn out to be stolen. Then they would want to know who you got it from, if you have no one elso to pass the buck to then they may just assume that you stole it. If you want a clear conscience, you should atleast try to ask the DMV if they can tell you weather or not it is stolen, if they can't help you, I am sure they can tell you where to go. If it is anything like it is here, even if it isn't stolen, getting that thing registered in your name could be difficult and time consuming at best. Your best option may be to buy a titled frame off of Ebay and swap everything to the titled frame. As long as the numbers on the motor are clean, you will have a legal machine.
Yours truly, sincerelly, love always, Josh aka The DirtDemon.