We checked the carb, fuel line and tank. All clear. The "old" owners said that the kart had been sitting for a year. I had removed all of the questionable fuel and added in new. It may seem that the new stuff "ate" all of the bad stuff? Anyhoo, its running well now.
Has anybody experienced it running out of fuel when Wide Open for a bit? It kinda seems that the Petcock is not allowing enough of a flow to keep up with the demand of the motor when wide open.