Ahh. I just bought the exact quad this spring. Great bike! I just got done changing some stuff and rejetting. If it wouldn't stay running, it's probably a carb issue. These bikes have no need for a battery other than to start them. You should know that these are built by Suzuki motor corp. and are the EXACT same bike as the Z or LTZ400 and the Arctic cat DVX400. Only differences are the plastics.
Some will say the frames are too light/have issues, but that is just something you are going to have to deal with. If it wasn't ridden too hard, it should be alright.
As for price, around here you'd need to get it under $2000. Any more and you can get some really nice running bikes.
A link to a pic of mine: http://sphotos.xx.fbcdn.net/hphotos-...59419124_n.jpg
I paid $2200 and it came with a slip on exhaust and 3 sets of tires.
Can I ask how you know how many hours are on it? I don't think I have one/can't find one.