I've got an RD400 out in the garage that was abandoned on an empty lot near my house.
Sat there for several weeks, so I asked around and nobody knew who owned it. The plate was missing, so I recorded the VIN # and called the local police, who told me it wasn't listed as stolen. I took it home.
The bike had been parked in an alley behind a rental house a few blocks away from where it was abondoned for 3 or 4 years. I think the owner of the bike moved out nd left it, so the rental owner just moved it to the empty lot to get rid of it.
The motor is free, and feels like it has compression.
Someday I might get it running and turn it into a cheap track bike.