Valve covers on B7100 old vs newer

[85Hokie]

NIW, or anyone else - tell me what these little trap doors are for?
Valve adjustment? or ?????

1990 valve cover :

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1992 Valve cover :

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[whitetiger]

They are to adjust the compression release for the exhaust valves. Your second picture is for a unit without compression release.

 

[85Hokie]

They are to adjust the compression release for the exhaust valves. Your second picture is for a unit without compression release.

That would make sense.....thank you much!