87131-ZY3-000 Side Mark - Overview. The 87131-ZY3-000 Side Mark is a genuine OEM part designed specifically for Honda marine engine systems. This side marking component serves as a visual identifier and decorative element on the exterior of Honda Active Marine watercraft. It plays a key role in maintaining the authentic appearance and brand identity of your vessel while helping keep your marine equipment operating reliably. The side mark integrates cleanly with existing parts and maintains optim