There is a drilling in the side of the plug in which you can put a size 3 Allen key or a Torx key T10 (usually found in the your BMW toolkit) in order to fit and remove it.
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Also referred to as oil filler cap.
The Racing footpegs are offered as a set (2 pieces)....
These covers for the open holes beyond the seat are made of...
The Enduro footpegs are sold in a pair. In addition...