This manual covers the 18 HP outboard motor models produced between 1965 and 1978. These engines are recognized for their robust engineering and reliability, making them a dependable choice for various watercraft applications. This comprehensive guide is designed to provide detailed information for the upkeep and repair of these specific models, ensuring their continued performance. The purpose of this service manual is to equip owners and technicians with the knowledge required for effective maintenance and repair. It includes detailed procedures for general information, lubrication, tune-ups, fuel system, electrical system, engine repair, lower unit servicing, and manual/electric starters. With step-by-step instructions, troubleshooting guides, and essential technical specifications, this manual serves as an indispensable resource for diagnosing issues and performing all necessary servicing to keep the 18 HP operating optimally.