87634-ZW4-D20 Mark (Epa 2006) - Overview. The 87634-ZW4-D20 Mark (EPA 2006) is a crucial identification label for Honda marine engine systems, specifically supporting the labeling and certification requirements related to environmental compliance. This component plays an essential role in ensuring that Honda marine engines meet emission standards established by the EPA in 2006. As a certified OEM part, it guarantees seamless integration with existing engine labeling components, maintaining optim