This service repair workshop manual covers the Tohatsu TLDI 40B and TLDI 50B outboard engines from the TLDI Series. These direct injection, 2-stroke engines, with a displacement of 703 cc, are engineered for reliable performance. The TLDI 40B delivers 40 HP, while the TLDI 50B offers 50 HP, making them suitable for a variety of marine applications. This comprehensive manual provides detailed service information, including complete machine disassembly, electrical component inspection, lower unit service, power trim and tilt operations, and tiller handle specifics. It also includes a thorough troubleshooting guide, installation procedures, test runs, and inspection after servicing. The manual is designed to assist owners, mechanics, and technicians in maintaining and repairing these engines effectively.