Re: 1st time buyer, Bayliner
There are lots of things to do, depends on your comfort level and knowledge. If you're not comfortable, spend a few hundred $$$ and get a marine surveyor. They know what to look for (and even specific issues with particular boats/engines)
Here are some things to do but I'm sure others can add more:
1)Compression check on all cylinders, should be over 100 and all cylinders should be within 10-15% of each other. If one is low, that may indicate internal damage or bad carbon buildup
2) Check the oil in the lower unit. If it is milky, that indicates a leak that has let water into the gear case
3) Check floor/stringers/transom. Looks for soft spots in them.
4) Make sure you test the boat in the water, not simply on muffs. See how it runs
5) Ignore the 'extras'. Its great it has a nice sounding stereo or a fishfinder and GPS. And, its important everything runs, but that's the 'extras' you care about after you've determined the boat is a good boat.
6) review any maintenance records if available.
7) consider taking it to a local marine and paying a few $$$ for a mechanical inspection if you're not comfortable doing it yourself.
8) Don't hesitate to ask the owner questions. If they won't take you for a water test because they don't have time, or the launch is too far, or any other excuse for only running it on muffs, or letting you have it looked at by a mechanic, then you'd be best to walk away. If it's been looked after and a good boat, they'll want to talk about it.
9) Lastly, think about it. The excitement of owning your first boat will sway your decision. Take time. If you want it, tell him you're going to think about it, call him back in the AM. You'll be heavily influenced by its appearance (it looks cosmetically well maintained) but remember, if you put lipstick on a pig, its still just a pig.
You'll see it again and again on this forum, "There are no bad boats, just bad owners" If its well maintained and you are careful, it'll be evident in what you're getting.