This document pertains to the Yamaha 5LK outboard motor, manufactured in 1985. Designed for marine propulsion, this unit represents a robust and reliable piece of engineering from Yamaha, intended to provide dependable performance in aquatic environments. Its construction emphasizes durability and efficiency, making it a suitable choice for a variety of boating applications. This Factory Service Manual, written in English, provides comprehensive guidance for the maintenance and repair of the Yamaha 5LK outboard motor. It covers essential areas including general information, periodic inspection and adjustments, fuel system, power unit, lower unit, bracket unit, electrical system, detailed specifications, and troubleshooting procedures. The manual includes step-by-step instructions, diagnostic information, illustrations, photos, exploded views, and wiring and circuit diagrams to assist owners, mechanics, and technicians in effectively maintaining and servicing the unit.