Put a new boysen cover on the bottom of my carb last year and since that haven't been able to get the jetting just right. I unscrewed the fuel screw 2.5 turns out and the popping seemed to stop and everything was just fine on my test rides. So thinking I have it all fixed I take it out and after about 15-20 minutes of riding it starts to miss a beat now and then. Then it started to cut out on me and then completly died. I couldn't start it for a while. After I'd sit for a while it started and I could ride for a minute or two but it would die again. My buddy says he things the fuel line is plugged or the carb is plugged so the engine isn't getting any fuel. Any ideas????