Re: When do you say enough?
I don't remember the hours an inboard engine is supposed to last before rebuild, but a savvy shopper would look up this information compare it to the hourmeter, and factor it into his offer. I do know that if, for example, a set of Chevy 350s usually needs rebuilding at 1,000 hours and the hourmeter shows 990, I would either walk away or offer a lowball price.
Outboards are, for me, a little different. I factor general condition, compression, and gut feeling in addition to the hourmeter if it has one.