Moped Army

I hope somebody can help me with this. I got my 00 Beamer out of storage the other day and it fired right up. I went for a ride and everything was fine up to 3/4 throttle when it would stumble for a couple seconds before picking up and running on up to the rev limiter. I thought it was bad gas so i pulled the carb for a good cleaning now when the engine is revved, it will run up to full throttle then it slowly dies like it starves for fuel. It doesnt matter how the carb is set, it will die every time. Somebody pls help.