I have a major oil leak coming from one of the four holes in the top of the cylinder head. I'm sure I found, in a previous Google, something on this thread about this being a rubber bung but I can't find it again. It looks like the other forward hole is covered by what looks like a large rubber bung, it's the front-left hole that's spewing oil everywhere.
My XT-350 parts PDF doesn't show anything in these two forward holes. Should there be something in there, if so does anyone have a part number for what's missing?
If it matters it's a 1987 import.