Kymco Super 8 - 4 stroke "grinding noise"

[waqr]

Last week I noticed a rattling sound especially during idling. I have checked all screws and nothing is loose. Scooter is running perfect but I want to know what causes this sound, any ideas?

I have checked both the CVT and fan side and can`t find the problem. Also no play in the crankshaft either. Below is two videos showing my problem

Any ideas?

Thanks!