28401-921-000KA Case *Nh8* - Overview. The 28401-921-000KA Case *Nh8* is a vital component within Honda marine engine systems. This recoil starter case serves as a durable housing designed to protect and support the recoil starter mechanism, ensuring reliable starting performance. Manufactured to meet stringent OEM standards, it seamlessly integrates with existing engine parts, maintaining optimal functionality and longevity.. Key Features. Durable recoil starter case designed specifically for H