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If it runs good now, it will probably run good for a while. The engine is 24 years old. Unless the previous owner used it an abnormally greater amount than the average owner, it probably only has around 600 or so hours on it. Unless it looks terrible, has lots of rust, is hard to start or runs poorly, I'd use it until I didn't trust it any more.

Of course, if you plan on taking the boat on trips far from shore or in very remote areas, you might want to consider a newer engine.