Those are small drive screws holding the serial plate on the transom clamp. You can just drive them out from the back side of the clamp with a small diameter punch. Replacement fasteners are available at McMaster Carr or Fastenal. Just do a search for “drive screws” on their websites.
Bob
1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1957 Evinrude Fastwin 18
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20
“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."
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This reply was modified 5 years ago by bobw.