Hi Vivo I seen the part you talking about, it actually have ridges that seems they should be open, I know in other Kymco scooters that's where the Water Radiator goes, but our scooters are air cooled. If I was going to open that part i will cut around the ridges and maybe install a screen in case of mud/Rain. Honestly I do not thin k there is anything Critical behind it. You can always remove the part and take a look what lays behind it.