Not sure if you are buying it from a dealer. If not has it been setting. Lots of talk about carburetors gumed up lately. Look for signs of how they took care of it. Any roughted up screws or bolts. Does the bike just look clean and sharp like it was well cared for its whole life?
These bikes are pretty reliable. I have had good luck, but has it been wrecked, was the rider rough on the bike, did they take care of it? Ride the bike or have them take you for a ride. How many miles on it. They last a long time but miles should be reflected in price.
Kelly Blue Book says the bike average selling price is $3,815. In my zip code. A dealer will get a little more.
All that said you are on your own. Take your time, leave and think about it before you move. Maybe post your thoughts here later.