Just bought the bike a few weeks ago. The bike ran perfect for the first week and a half. The other day I drove it 20 miles, ran perfect. Got on it to go back home(20 miles), made it about half way home before the bike started to struggle and sputter and eventually died. Wouldn't start for about 5 minutes until I gave it full choke. Did this 2 more times before getting towed home. Friend put his bike battery charger/tester on it, it ran alright but was flooded somewhat, and idled fine for about 5-8 minutes. Showed 14.1 volts charging. As soon as the cables were pulled off the bike died and wouldn't start. So I went out and got a new battery, charged it up, and tried to ride it today. Same thing, wouldn't start, struggled alot, ran rich, and thenhad to put on full choke. Drove it to the end of my neighborhood where it died again. Started it up drove it about a mile, before it died again. Full choke, this time turned fuel valve to RES instead of ON, and it seemed to run better. Drove to school fine, drove to work fine. Got on it after work, started fine, ran fine for a mile then it died. Turned on RES again and full choke, started it and rode it home. The whole way home it felt like it was being choked and something was dragging it down. Can anybody please help me. This is my only way of transportation and I just bought it, I just want to enjoy riding it instead of having problems. I feel like its a fuel/spark problem, but I really have no idea. It's an '02 Kawasaki ZX6R btw.