Spend some money with an knowledgeable Mercury Outboard mechanic. I would recommend doing a test run, drive it see if u like it. If it is still the boat you want after the ride and your price is agreed upon then at that point by yourself some insurance and have a good MECHANIC not surveyor checking out. Spend the money with the mechanic after everything else checks out good. Take a yellow table and make a list of every item on the boat that needs attention lights, battery, polish, bilge pump ect. and ask the mechanic what he would charge to repair these items. You will spend a couple of hundred bucks for compression leak down, inspecting the fluid in the lower unit. It is money well spent and like I said cheap insurance.