Hi again, No poping back through the carb. The gas is good, I have been riding it all along. It just started acting up when I started it last week. I ride it about twice a week, sometimes more. It starts great, it idles great, it runs great up to about one third throttle. As soon as I hit one third throttle it quits and I have to let off and it runs great again. It does not matter if I go up slow with the throttle or fast. When it gets to that point it quits. As soon as I let off it runs great again.