1989 Yamaha Outboard 40SF Outboard Repair Maintenance Manual. This Factory Service Manual is the absaloute 100% best manual available for your Outboard. This complete service manual covers all repair topics such as:
General Information
Periodic Inspection and Adjustments
Fuel System
Power Unit
Lower Unit
Bracket Unit
Electrical System
Specification
Troubleshooting
+many subsections of the above
All of the above have many subsections +Detailed Wiring and Circuit Diagrams, illustrations, photos, exploded views and step-by-step Instructions Diagnostics and similar topics.
JD