The cap gasket, one-way diaphragm, and valve base gasket should be replaced. The brass components should be cleaned. Light corrosion can be removed with vinegar.
To remove the IC cup assembly, utilize a 10mm deep well socket to remove the nylock nut inside the valve, then simply wiggle the flywheel while pulling outward. DO NOT PRY. The valves are brass, easily damaged, and are very expensive.
The valves should be cleaned with solvent and regreased with Evinrude triple guard grease.
Gluing geek since 2007