I have a 2008 Hyosung gt250. I just got it as a project because it didn't run. I put fuel down the carb and cranked it and it fired up for a little. As I was cranking it then the starter started to slow down and then it stopped and now nothing happens when I press the start button. I figured it was the battery but I had it tested and it's still good. Does anyone know what could have happened?