Running belt noises troubleshooting

1. Noise from behind, continuous and light. (The belt touches the rear roll guard)
        New rear roll caps (replaceable by the customer)

2. intermittent and metallic noise (clak-clak).
        21. Have you ever had to center the belt?
            Yes. Running belt overtension.
            Technical. Front and rear roller.
            Check instructions on the blog to center and tension properly running belt

3. Noise-like noise
        31. Engineer: engine/motor

4. Sparks emanating from the engine/motor
        41. Engineer: motor