Hello. Thanks for de idea DMadigan. I’ll check eventhough I don’t relate the sound to engine vibration or engine speed. The noise is there even with the engine off. I tested it running downhill with the engine off. The noise seems like there is weired bird inside.
I uploaded a video at this link.
https://www.instagram.com/p/B9M7c13Be6h1LjmwsLlV0uQPu30nlcOLUnqE2M0/?igshid=i2evpmh8oxab