On my recently acquired Kitfox 3, I decided to replace
the coolant with DexCool (who knows what it had!)

I pulled the cyl head vent tube and found that the
metal nipple where the 1/4" tube plugs on the RADIATOR
side of that vent tube is CLOSED.... it was NOT drilled into
the inside of the metal neck just below the fill cap?

Shouldn't that nipple be open to the inside of fill cap neck?
It's not an obstruction - it simply was never drilled.

I hope my question makes sense, please let me know your
thoughts before I drill it thru.
~Wild