90704-PH7-000 Special Key - Overview. The 90704-PH7-000 Special Key serves as a crucial locking and mechanical securing component within Honda marine engine systems. It is designed to provide a reliable and unique security mechanism in crankshaft and piston assemblies, helping maintain precise alignment and efficient engine operation. Manufactured to stringent OEM standards, this special key guarantees seamless integration with existing Honda parts, maintaining optimal performance and durability