TS 250/1 no longer starts

Moin, on the other hand, gradually built up a TS which had not been moved for about 12 years. TÜV-certificates passed without defects. The engine always started without problems, however the engine did not run round and took off badly, especially when the engine was cold. Now after the part TÜV had had and was registered I wanted to drive a short distance to do all necessary adjustments afterwards, but this exit lasted only 2 kilometers. After I let the machine go I tried to start again after a while. The part didn’t start. When the engine was pushed on, only a few attempts were made but I couldn’t start the engine. Then I checked the ignition again at home (was ok.). I removed the carburettor and cleaned it up. I just didn’t want to start the emme. At the moment I am finished with my ideas. Would mic h happy if one of you may have another tip for me.