90551-ZE1-000 Clip (18mm) - Overview. The 90551-ZE1-000 Clip (18mm) is a crucial component designed specifically for Honda marine engine systems. This clip plays a vital role in securely holding the piston pin in place, ensuring smooth mechanical motion and reliable operation within the engine system. Manufactured to exact Honda factory specifications, it guarantees perfect fit, seamless integration, and optimal performance for maintaining the integrity of your marine engine.. Key Features. Spec