[willy]

What Spare said as usual is right on the money, I would add a couple of things, Suzuki's don't have a lot of resale, especially the older engines because unlike Yammi and others they did not have a big support network and parts were harder to get. That varied of course by where you were located. As far as quality and durability they are as good as any motor made, just like their motorcycle engines they are tough and hold up very well. A fellow down at my old marina had two of those engines you are looking at on his 24 foot CC and had over two thousand hours on them as of the last time I saw him. He was an older fellow and said he had had every engine make there is and that they were the most trouble free and reliable he had ever had.
In regard to parts now that has improved tremendously in most areas.
In regard to your specific engine you are looking at, unless they are extremely low hour engines, say under two hundred I believe he is way out of line price wise. I know for example that at the dealers that still have them you could by a brand spanking new Yamaha 150 two stroke carb for 6500 dollars. I was going to take a road trip to one of the dealers in I believe Virginia or Maryland to get it.
So keeping that in mind I would negotiate and investigate real close that deal, and I would talk with guys like Skools and Big Shrimpin and see what they had available. Especially if a mercury and BS went over it, or if Todd(Skools) had a Evinrude/Johnson available.
Those along with Ferm and Spare and others on this site are who I would seek out first.