Hello and good day on all sides. This is my first contribution here in the Roller Forum. It’s about… My acquaintance had got a Benzhou scooter from a hobby screwdriver about 4 months ago. first everything was fine and he drove well. Then it came to a bang and the belt is torn. that was changed afterwards, then fell on the Vario weights were strongly worn out, were thus also made new. After that he drove again as licked and also came on pleasant 55km/h. Since But only for about 2 weeks. Then, according to her statement, it started sporadically, mostly in the warm condition, which he was at full throttle shortly before and did not manage more than 40km/h and that also only bend with and break on straight track. As soon as the mountain went up, the performance went rapidly into the cellar up to about 20 to 30km/h. I already looked at the clutch myself, but looks ok. Carburettor was of course already thoroughly cleaned. Now the whole does not occur anymore. sporadically, but is already in the cold condition as described and does not change either. I don’t quite know if I should dare to take the cylinder apart, because it might be because it can’t be built enough pressure anymore… So I’m going to turn to you with this problem, wanted to go into the garage anyway and would be happy about helpful tips that might spare me the whole thing to take apart. Say hello to your friend Shag, alias Thomas