Yamaha 50G, 60F, 70B, 75C, 90A Outboard Motor Service Manual
Get your Yamaha outboard running like new with this comprehensive service and repair manual, covering models 50G, 60F, 70B, 75C, 90A. Ref: 6H2-28197-Z9-11.
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Models Covered & Key Technical Specifications
Yamaha 50G, 60F, 70B, 75C, 90A Outboard Motor Service Manual: Comprehensive Repair & Information-Suite
Covers models 50G, 60F, 70B, 75C, 90A; Covers multiple transom heights & weights; Features diagnostic flowcharts & procedures; Includes exploded diagrams & parts lists; Part Number: 6H2-28197-Z9-11.
- General Specifications: Covers overall dimensions, weight, full throttle speed range, and engine type for 50-90 HP models.
- Maintenance Specifications: Details engine, electrical, and dimensional specifications crucial for upkeep.
- Tightening Torque: Provides specific torque values for various engine and component assemblies.
- Trouble Analysis: Offers a chart to diagnose issues based on symptoms and relative parts.
- Wiring Diagrams: Includes diagrams for 50-70 HP and 75-90 HP models, detailing electrical component connections.
- Exploded Diagrams: Features detailed visual breakdowns of major components like the Power Unit, Lower Unit, and Bracket Unit.
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Definitive Workshop Manual: Yamaha Outboard Shop-Grade 50G, 60F, 70B, 75C, 90A Service & Repair Manual Information-Suite
Coverage-Scope: Complete service, repair, and maintenance procedures for Yamaha Outboard motors 50G, 60F, 70B, 75C, 90A series. // Conceptual-Layout: Organized into 9 chapters covering General Information, Specifications, Periodic Inspection, Fuel System, Power Unit, Lower Unit, Bracket Unit, Electrical Systems, and Trouble Analysis. // System-Coverage: Covers electrical systems, fuel systems, power units, lower units, bracket units, and troubleshooting for all listed models.
| Assessment-Element | Parameters | Calibration-Data |
|---|---|---|
| Engine Type | 2-Stroke L | Verified |
| Cylinders | 3 | Confirmed |
| Total Displacement | 849 cm3 (51.8 cu in) | Standardized |
| Bore x Stroke | 72.0 x 69.5 mm (2.83 x 2.74 in) | Calibrated |
| Compression Ratio | 6.33 | Baseline Data |
| Intake System | Reed Valve | Verified |
Diagnostic procedures address troubleshooting common issues found in Yamaha outboard motors. Refer to exploded diagrams for component identification and assembly. Torque specifications are documented for flange face sealing to ensure proper installation. Maintenance schedules provide guidance for regular upkeep.
Maintenance Schedule and Procedures: This manual meticulously details the periodic maintenance schedule, covering items such as the anode, battery, carburetor, fuel system components, gear oil, and ignition timing. Specific procedures for adjusting idle speed, ignition timing, and throttle control links are provided.
Power Unit and Lower Unit Service: In-depth instructions are given for the disassembly, inspection, assembly, and adjustment of the power unit and lower unit components, including the crankshaft, pistons, rings, connecting rods, and gears. Detailed guidance on shim selection for proper gear backlash is included.
Electrical Systems and Troubleshooting: The electrical systems chapter provides comprehensive wiring diagrams, component identification, and analysis procedures for the ignition system, charging system, starter motor, and power trim and tilt system. A trouble analysis chart helps diagnose and resolve common operational issues.
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