I just noticed oil leaking from here and i’m not sure what that black cap is? What should I do and what is the name of it?
It's called a couple different things, camshaft plug, rear cam seal, but Honda calls it a cylinder head plug. It's a common leak on the R18s. 12513-P72-003 - Genuine Honda Plug, Cylinder Head that's the part you need, it pops right out