@facundo-duarte
There are loads of unused block connectors all over my 1988. Just cause it’s there doesn’t mean it HAS to be used…
Your jetting is perfect for a late model Mikuni 28mm flatslide…
I’d try removing the side of the air box yourself (don’t take somebody else’s word on it) and remove the the foam element. They fall apart over time, especially the aftermarket ones….
They need cleaning with solvent, or petrol but make sure it’s proper dry. Then you have to wet it with oil and squeeze out all the excess…