The title pretty much tells it all. I have a stock ZX-50 that last year all of a sudden started dying. I put it up and at the beginning of this year took out the carb and cleaned it. I thought that might do it but no it didn't. I can start the scooter and it will idle all day. I can ride it slowly around in circles and no problem. But when I take it up the street and give it some gas it gets up to speed and then the engine just shuts down. What can I do?