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A dry rotted primer ball with holes in it is a problem plus I would also be worried about the fuel hoses condition too. Inspect everything related to the fuel system carefully. If the hoses leave a black film on your hands or show signs of checking or cracking, feel soft and squishy, or are very brittle, replace them all.
It may be a good idea to cut the primer bulb in half along with a piece of fuel hose and inspect the interior for deterioration. Today's ethanol fuels and moisture can result in phase-separation and if that mixture gets into the fuel system, damage can occur because the alcohol-enriched phase-separated liquid is much more corrosive than plain 10% ethanol (E-10) gasoline.
Be sure to use a Genuine Evinrude primer ball and not an after-market brand.
"There is never just one thing wrong with a boat";
-- Travis McGee, main character in a book series by John D. McDonald
The factory recommends that a properly trained technician service your Johnson or Evinrude outboard motor. Should you elect to perform repairs yourself, use caution, common sense, and observe safety procedures in the vicinity of flammable liquids, around moving parts, near high-temperature components, and working with electrical or ignition systems.
The information offered here is only general in nature and should not be construed as complete factory approved procedures, techniques, or specifications. Always use the proper service manual for your motor, up-to-date service literature, the correct tools, and have an understanding of how to proceed with troubleshooting and repair methods. If you are unsure or uncomfortable with a procedure, a situation, or a technique, enlist the services of a factory trained technician.