Honda MT does not run cleverly

Good morning together, I have to catch up a little before my question comes up: My daughter kicked me to make the old MT8 fit again. I had bought this at 16 years 1985 for 770,00 DM used at the dealer and at that time only drove and at the most filled up and filled oil. Daughter has been with me for 2 days and then I was responsible for the rest. It packed me properly and when I saw that you still get good spare parts, I was no longer on I am a little unorthodox to the thing and first of all I did to the mechanics (wheels, brakes, bodywork, fork etc.) I also painted a new one (painting booth were hanging some plastic foils in the carport from the ceiling.) After that I am to the electrics (there was some dep 35 years ago). I did it three times until everything was right. After that I cleaned the tank, carburettor, oil pump, air filter and installed it again. d I looked at the inner surfaces of the cylinder and then moved the piston carefully. New spark plug, ignition cable etc. and also assembled here again. So everything was back in its place and made pretty but I still did not know if it will start at all. I then built an suction for the basement from a vacuum cleaner and hose and tried to start it. And at the second kick it was there…… squealed like sow, but was also oil in the combustion chamber, so nothing jammed I ran them a couple of times, sometimes a few minutes longer and they purred like before when we were young. So out of the basement and a few laps on the road in front of the house turned. Lief actually quite well, where I drove only up to approx. 40km/h. So off to the TÜV and trembling. The examiner also turned his laps and gave me a fault-free moped attesting with the words “is everything as new”. You have to say that they only about 8,000 km r and it was well stored for 30 years next to the open heating cellar. So for approval and then turned on it and several bigger rounds. It went out normal from below (as you can feel with 20 kilos more than before) and I am on advice of my buddy very slow and with low speeds to the thing. Only after about 30 km I am over the 50Km/h and then I realized that she doesn’t want to pull anymore and a clump (similar to a tractor) set itself up. When I then drove again slower, it went back to normal. Also the next day with passenger times, actually pulled itself out quite well. And now since yesterday something is not right. It does not go well anymore and then sounds terrible. Lets only start with 1/4 gas and smokes, smells and curls only. Sparkling candle is wet and smells like fuel. Have once the flute out and there also everything is quite wet (had the F soldering, the stuff is wet, too.) For this she always presses a little fuel after driving out of the Vegas tube. At first I thought it was related to the mixture that I had first for the first attempts in the tank (because the oil pump had to suck in) because it was always so greenish what came out of the tube. But now only fuel. I tried to push it yesterday in the second gear, but also there she doesn’t want to go properly… Where should I start now best? with the troubleshooting? Thanks for reading and already for help Greeting Jens