This workshop service manual covers the Yamaha Z300 LZ300 outboard motor, produced between 2004 and 2006. This 2-stroke, 2-cylinder, in-line engine features a displacement of 294 cc and utilizes a carburetor for fuel delivery and a CDI ignition system. It offers both pre-mixed fuel or oil injection lubrication and is water-cooled for optimal performance. The transmission provides forward, neutral, and reverse drive with a typical gear ratio of 2.00:1. Yamaha's commitment to engineering quality and reliability is reflected in this robust outboard motor, designed for dependable operation in various marine applications. This comprehensive English-language manual is designed for technicians and owners performing self-maintenance. It provides detailed information on engine, transmission, fuel system, ignition, electrical, exhaust, and body systems. Within its scope, you will find essential technical specifications, step-by-step maintenance procedures including tune-up tasks like spark plug gap adjustment and carburetor calibration, diagnostic information, and troubleshooting guidance. The manual also references any required Yamaha special tools and outlines recommended maintenance practices such as regular servicing and impeller checks, ensuring the longevity and optimal performance of your Yamaha Z300 LZ300 outboard motor.