Re: No VIN just frame number (Redisfaster)
Don't buy it if it doesn't have a Title or a VIN.
A Certificate of Title is prima facie evidence of the ownership of a vehicle. Keep in mind that in several state laws (Illinois, Arizona, etc), the definition of a stolen motorcycle is a bike being held by a person who is not in current possession of the Title, or any motor vehicle without a VIN.
Also, federal law requires insurance companies to supply a Salvage Title, Recovered Theft Title, Junk Title or Dismantled Title at time of transfer. The following ten States also use Salvage Titles to identify stolen vehicles - AZ, FL, GA, IL, MN, NJ, NM, NY, OK and OR.