Kura grinding noise

[gunnarkant]

Hi,
few days ago, my Kura (far less than a year old) has started to make a grinding noise.

I uploaded two video files where you can here it

https://drive.google.com/file/d/133N95e ... sp=sharing
https://drive.google.com/file/d/134tZJ_ ... sp=sharing

How can I solve this issue ?

Thank you.

[koldobar]

A mi me empieza a soñar como si fuera la correa, Alguien sabe si se puede tensar o engrasar?