This manual pertains to the Tohatsu 90 HP outboard engine, a robust and reliable power unit designed for a wide range of marine applications. Engineered for performance and durability, this engine represents a significant investment in boating capability. Its design prioritizes user experience and operational efficiency, making it a trusted choice for recreational and professional boaters alike. The comprehensive coverage within this manual ensures that owners and operators can fully understand and utilize the capabilities of their Tohatsu engine. This Service Repair Workshop Manual provides detailed information for the maintenance, repair, and servicing of the Tohatsu 90 HP outboard engine. It is written in English and includes step-by-step instructions, diagrams, and illustrations to guide users through various procedures. The manual covers general information, lubrication, powerhead overhaul, lower unit service, trim and tilt systems, and more, including troubleshooting and diagnostic support. Intended for individuals with basic mechanical skills up to independent service professionals, this document is designed to help maintain the engine's optimal performance and longevity.