i got my bike running today, but i got a problem wich i`ve had since i installed the motor, i get it going. and it wont give speed the 1st time i start it, if i lose my speed the motor stops, and if i twist the handle to get more speed the motor get more rpm. but the chain wont go around. so i have to pedal around and make sure it wont stop, and suddently the motor "starts" and i can drive around

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