Just leave it alone. It allows steam out but very little in the way of oil follows the steam. You can always wipe the top of the rocker cover if you ever find it necessary.
Incidentally, in case anyone reading this has not so far guessed this - I am a tight fisted Yorkshireman who believes in getting what he can do out of parts, particularly original parts, before I replace them with what are often inferior modern pattern parts.
Leave it alone for at least 1000 miles on running in oil and then another 1000 miles on normal oil. By that time you might have found out whether there is a need for anything else.
I wonder if the blocked oil feed pipe might be a clue? Could this have been blocked for some time, perhaps, leading to high wear on the rockers and shafts to the extent that they now leak lots of oil? Running the engine with the rocker cover off might prove illuminating here.
Is the pressure relief valve working properly? My bike runs at a pretty constant pressure between 20 and 30 psi once it has gone through the initial warming up. If you are getting a higher pressure than that consistently, suspect the pressure relief valve. If this isn't working, the excess oil might well be coming out via the rockers.
You have got the oil feeds the right way round haven't you? The small diameter pipe feeds the rockers, the large diameter one feeds the oil gauge.
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