Keeway RY6 no power by part wave

Hello, I need advice from someone who really has a clue. Briefly to me: Daniel, 24. I have to drive scooters again. So I bought a used RY6. There was nothing done about it. Then I went to work. Since the original pot was over I made a new sportauapuff drunder. Leovince TT Handmade. Drosselung is still in it. Since the old cracker was so tightly attached to the cylinder, I also renewed it. Is a quite normal one. 50ccm cylinder with new piston and gaskets. The arrow also points to the bottom. And otherwise everything worked well. Then I put the oil pump still blind. So all cables closed. Also the on the carburettor. I then of course mixed fuelled. Circa 1:50. When installing a distance ring then the Vario broke to me. So I ordered a price value here as well and built in with the included weights. And because I’m just about I also renewed the two switch unit on the steering wheel. On the left now functions as it should and on the right unfortunately did not fit. That’s why it is still missing. Then of course I wanted to see if and how everything is going. Starting via Kickstarter took a bit of time but then the planer ran quite comfortably in idle. But when I then give gas no power. I almost don’t get off the spot and when I give it full throttle it goes When I let out gas he catches himself and runs again normally in idle. I then installed again the lighter weights which accompany the exhaust. But that did not bring any improvement. I checked everything again for leakage or other errors. But nothing found. Gasoline and air he gets enough, in my opinion. I also had the carburettor open. Seen everything well. When then my dad said that it sounds like he got too much gasoline I almost completely turned the gas/air mixture scraper. Then he already ran a little better. But he didn’t really have the power yet. I just brought it to 20 kmh. Without a distance ring. I find something little. Still further I can’t turn the mixture screw in. Then the engine almost goes out. So the thing stands now in the garage and brings me to despair. Does anyone have an idea?