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I hope there is someone in here with insight into engine issues. The thing is, my wife's MBK electric bike with Yamaha mid mount motor behaves somewhat worryingly. It runs really well for the first few miles. Suddenly, loud periodic noises begin to come from the engine and it loses traction. The...

Thanks for letting me into this forum I'm from Denmark and fairly new to the world of electric bikes That is: I bought an used e-bike for my wife. I'm seeking information about DIY motor repair and I will post some questions in the right thread