Two weeks ago it started. My scooter (Nova Motors GT4) took the gas worse and worse. In the top he lost a few km/h. This with the gas became worse and worse, until today I got ultra-lahm at my top speed. He also soff again and again at the traffic lights. First only after longer distances (from 3km full gas). Finally also after very short distances. Today on the way back he suddenly jerked, as if the fuel had gone out. I stopped and did not have it. I cleaned it at home and also installed a new spark plug. The spark also came. He didn’t want to come anyway. I tried it a few times. For a moment it seemed as if he was coming. But he didn’t work on it. I tried it again with the pedal. On the third or fourth time he was stuck. Does not move a millimeter more. I suspect that the oil pump was defective and that the creepingly noticeable thing was. Or what do you think?