This manual covers the Yamaha 4LH Outboard Motor, manufactured in 1987, designed for marine propulsion. Yamaha is recognized for its commitment to engineering quality and reliability, ensuring dependable performance for its watercraft. The 4LH model exemplifies this dedication, offering robust construction and efficient operation for a variety of marine applications. This comprehensive Factory Service Manual, written in English, provides essential information for maintaining and repairing your Yamaha 4LH. It details general information, fuel system, power unit, lower unit, bracket unit, and electrical system maintenance, alongside a thorough troubleshooting guide. With step-by-step instructions, illustrations, photos, exploded views, and wiring diagrams, this manual is an indispensable resource for owners and technicians seeking to preserve the optimal condition and longevity of their outboard motor.