Hello, yesterday I bought a scooter from Rex, according to the vehicle license factory name SHENKE Type GY variant 5F for 270€. it is from 2010 and has almost 6500km. today I drive with it, and suddenly when driving the speed decreases at increasing speed. I give gas and hear that it runs higher, but it does not move away. it reminds me of a bike that has jumped out of the chain. it is my first scooter and bought by private, with handwritten purchase agreement about price and roller details. without listed defects or clauses. I just don’t know what I can do now, can I help jmd with? does anyone know the cause or possible causes? am totally fucked up and disappointed. am grateful about any help and answer greeting simon