It would be nice if there was a centralized database of stolen boat engine serial numbers that a person could check before buying a used engine. Unfortunately, some people might not care if they are getting a "deal".
in some states don't you have to register your motor as well as the boat?
I know if i bring this up as an option, people here will start complaining about more registration fees, government oversight, blah blah blah.
but if it were a 10 dollar, pay it once decal type deal i personally wouldn't be opposed.
Once motors became 'traceable' it would (should) cut down on theft.