Here is a clip with what happens: https://goo.gl/photos/LdJuEaTpaWuNNmmcA and here the problem is more evident: https://goo.gl/photos/v7oghbQxYuruxZfbA This is happening almost every time, when I ride. BUT on Console everything is ok . I am sure there is an issue with the engine. Cables are fine. I restarted everything. When I disconnect the battery / console everything w orks ok. The problem is only when on battery. If I use maximum level of assistance it is a real battle between the acceleration and resistance . You can hear the noise.. Any help please what should I do? It is very hard to find a dealer where I live.