2 clock motor Turns up by itself

Moin all together, I’m new here and I have a question. With my Kreidler Dice SM 50 LC the Bowden train is torn at the gas handle. Had taken the slider out of the carburetor during the repair process. As far as so good. Machine drives again. Now I have only one problem. As soon as the machine is warm, it turns directly up to 7000. What could this be? I already thought about the stand gas. But that’s not and so slowly I doubt. Thanks in advance for the answers.