If that noise is coming out of the belt area, then that clattering can't be good.
You will have to open it up and test with the casing open.
Don't ride, just rev it while on the centre stand.
You will need an electric power ratchet to undo the variator and clutch nuts, if you need to look at those components.
Make very sure, when tightening up again, that you first hand tighten before using the power tool, or you could accidentally mess up the threads(I did that), a very expensive mistake.
If you take out all the parts and then run the engine with no belt, variator or clutch, then you can see if noise is from the engine, or final drive area (spin the back wheel by hand).
Some ideas for you to work with for now.
Good luck.
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Thank you for your descriptive reply! I did what you advised indeed but the problem is, the noise is not constantly coming. It begins when I am on the way for example and it goes after a few kilometers. Once it began when I was passing by the mechanic's location but it had been already gone when I arrived the workshop.
A mechanic said not to worry about it because the reason is a slipping clutch for him. I am not sure about this idea because in my opinion if the clutch is responsible for the noise, it should not make that sound when idling. The sound is coming regardless of movement but it gets louder proportionally to the speed and the rev.
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