Hi all, I bought a used Vivacity. So far it was in good condition only when starting it has problems. At first I thought it was a small problem, now I don’t know any more. Problem: The scooter starts perfectly and sounds clean. When trying to give gas, the speed increases only moderately, accordingly the scooter accelerates only very slowly, until about 15 km/h. After that the speed increases significantly and after a short pipe hole The roller accelerates normally, except for maximum speed. Occasionally, a buck can be felt. As soon as the speed of the braking has to be lowered and accelerated again, the procedure repeats. Idle and air mixture can unfortunately not be precisely adjusted on the carburettor. No immediate reaction, therefore also carburettor exchange (see below, no change). Previous work: membrane block controlled and cleaned (impeccable condition) intake manifold changed carburettor control alt, nozzle change, alternative carburettor tried (no change) air filter box renewed false air test performed (everything okay) petrol filter and hose changed, petrol is easily sucked in Exhaust tested for tightness (okay) Exhaust removed (no power change) Exhaust without silencer mounted (no power change) As already described, the problem refers to the speed of the engine and not to the transmission power to the Variomatics. the complete unit checked and partially renewed. Transmission (okay) Coupling tested and cleaned Belts renewed fan disc (inlet tracks and broken lamellas) Variomatics completely renewed As the last point I now only have the CDI in mind. However, the statements in the net are spongy, as far as the error picture is concerned. If it should not be, I don’t know any more, as all components have been tested or replaced. I have not tested the compression yet, abe r the scooter starts very well, no engine noises, it runs well at speed. Has anyone ever had something similar? I am grateful for every advice.