This comprehensive service and repair manual provides detailed information on maintaining and repairing your Yamaha 60C, 70C, and 90C outboard motors manufactured in 2004. It is an essential resource for both experienced mechanics and DIY enthusiasts looking to perform their own maintenance and repairs. The manual covers a wide range of topics, including general information, specifications, periodic inspection and adjustment, fuel system, engine, lower unit, bracket unit, electrical components, and trouble analysis.

You'll find detailed instructions on identifying your motor, understanding safety procedures, accessing serial numbers, and selecting appropriate oils and lubricants. The manual includes clear and concise specifications for various components, including engine, lower unit, and electrical systems, making it easy to find the information you need quickly.

The section on periodic inspection and adjustment covers essential maintenance tasks such as battery checks, carburetor adjustments, spark plug replacement, and gear oil changes. The manual provides detailed instructions and diagrams to ensure proper procedures are followed. Furthermore, it includes comprehensive coverage of the fuel system, encompassing fuel lines, fuel filter, fuel pump, and carburetor, with details on removal, cleaning, inspection, and assembly.

The engine section delves into the intricacies of the outboard motor, covering cylinder head, cylinder block, piston, piston ring, crankshaft, reed valve, thermostat, crankshaft main bearing, and drive gears. The manual provides step-by-step instructions for disassembly, inspection, cleaning, and assembly. The lower unit section focuses on the gear case, water pump, propeller shaft, and other components, with detailed instructions for removal, disassembly, inspection, and reassembly.

The bracket unit section covers both manual and hydraulic tilt models, detailing the removal, disassembly, inspection, and assembly of the bracket, tilt sensor, and hydraulic tilt unit. The electrical components section provides a comprehensive overview of wiring diagrams, electrical analysis, and inspection procedures for various components, including ignition, magneto, sensors, relays, and warning systems.

Finally, the trouble analysis section provides a detailed troubleshooting chart to help you diagnose and resolve various issues you may encounter with your Yamaha outboard motor. This manual is designed to empower you with the necessary knowledge and instructions to effectively maintain and repair your Yamaha 60C, 70C, or 90C outboard motor, ensuring its optimal performance and longevity.

The Yamaha 60C, 70C, and 90C outboard motors, produced in 2004, are reliable and powerful engines designed for a variety of recreational and professional boating applications. These models, part of Yamaha's renowned four-stroke lineup, are known for their smooth operation, fuel efficiency, and low emissions. The 60C, 70C, and 90C share a common design, featuring a 4-cylinder, 1.8-liter, overhead camshaft engine with a displacement of 1101 cc. They are all equipped with electronic fuel injection (EFI) for precise fuel management and consistent performance, regardless of altitude or temperature changes. These motors boast a lightweight, compact design, making them easy to install and handle. Furthermore, their robust construction ensures durability and long-lasting performance, even in demanding conditions.

The 60C, 70C, and 90C models offer different horsepower ratings, catering to diverse boating needs. The 60C, as the name suggests, delivers 60 horsepower, making it ideal for smaller boats and fishing applications. The 70C boasts 70 horsepower, providing more power for larger boats and watersports activities. The 90C, with its 90 horsepower rating, offers the most power in the lineup, enabling fast acceleration and comfortable cruising for larger boats or heavier loads. All three models feature Yamaha's signature quiet operation, minimizing noise and maximizing comfort for those onboard. Additionally, these engines are known for their low maintenance requirements, reducing the time and expense required to keep them running smoothly.