i need help troubleshooting my suzuki 4 wheeler?

[tracy r]

I have a 2004 suzuki z400 quadsport. I got the quad brand new four years ago. I have less than 50 hours of use on it. I have maintained the bike so well up until I was transfered last year. I have started the bike off and on thoughout the year but have done little riding accept around the block. Today I went to start it and of course the battery was dead. I got a new on and changed the oil. It took forever to get the bike started and once running it died out really quick with a backfire, I finally got it running and took it around the block and I ended up pushing it back. It sounds like the fuel is resticted but I dont know how to fix that, or is a carb problem, What should I do? The coolant is low could it be that not letting it keep running? Help