I'd be very cautious about buying a plane with any history of low engine times (less than 40 to 50 hours/yr). I bought a 152 that was getting constant use (200hrs per year and regular maintenance) but had sat for about a year and a half. I flew the plane but only averaged about 40 hours per year for the first few years. Long story short, the engine was about shot at 1500hrs (with a 2400 tbo). I put a rebuilt in it and now fly about 70-80 hours per year (get up every week). The engine is strong with mid 70's compression every year for the past 7.
When you get one, you also should consider running Shell's new W100 plus oil which I understand helps reduce fouling and corrosion.
