In most cases, the serial number on a motorcycle is not enough to determine whether it’s been reported as stolen. However, some exceptions may help you determine if your dirt bike has been listed with police agencies as either lost or stolen. If the vehicle was bought from a dealership and they were able to provide you with the original owner's name and address, then the chances are good that this person will have filed an insurance claim for theft when he/she discovered their bike had disappeared. You can contact them directly by using the information provided in these records.