Try:
http://an2flyers.com/ there is a great engine startup soundtrack there.
What a superb machine! Used a lot in the DRC.
The joke is that "they are very well designed, you know? They run out of fuel just before they run out of engine oil ......."
One tricky aspect about them I am told is that they have a problem with oil running past the rings on the lowest barrel. This measn that if you leave the machine parked for greater than 45 mins you have to pull a plug from the bottom cyclinder to drain out the oil otherwise you get a hydraulic lock.
I met someone in Khartoum who was talking about overhauling a bunch of AN-2s and selling them once done at $35,000US. Very tempting.
Let me know what you find out by the way - I'd be interested to know how much they cost to operate.
Steve