Yamaha Outboard 115 HP LF115B 4-Stroke 2014–2017 Service Repair Manual

🛠️ Yamaha Outboard 115 HP LF115B 4-Stroke 2014–2017 Service Repair Manual – PDF Download

🔧 This official Yamaha factory service manual provides detailed maintenance and repair instructions for the 115 HP LF115B 4-stroke outboard engine. Designed specifically for the left-hand counter-rotating model, this manual includes full diagnostics, diagrams, and procedures for engine, electrical, and lower unit systems.

📲 Instant PDF Download – Fully searchable and printable. Works on Windows, Mac, iOS, and Android devices.

📖 Model Background

The Yamaha 115 HP LF115B (also known as F115B in certain regions) debuted in 2014 as a second‑generation update to the original F115A engine from 1999. It features a newly designed 1,832 cc DOHC inline‑4 EFI powerhead, delivering the same 115 hp output while cutting approximately 14 kg in weight—thanks to a lighter bracket, casing, and cowling. Improvements included reduced vibration from new rubber engine mounts and wheelweight, plus a refined intake and exhaust layout for better mid-range torque and smoother performance. The LF115B became a go-to mid-range outboard in Yamaha’s FourStroke lineup, prized for its power‑to‑weight efficiency, trolling control, and reliability in both recreational and commercial marine applications.

📄 Manual Details:

• Engine Type: 4-Stroke, DOHC Inline 4-Cylinder
• Displacement: 1832cc
• Fuel System: EFI (Electronic Fuel Injection)
• Ignition: TCI Microcomputer
• Starting System: Electric Start
• Cooling: Water-cooled with thermostat
• Trim & Tilt: Power Trim & Tilt (PTT)
• Recommended Spark Plug: NGK LFR6A-11
• File Format: PDF (Searchable)
• Total Pages: 500+ pages

📆 Model Years Covered:

📚 Manual Sections Include:

• General Information
• Maintenance chart, torque specs, model ID locations
• Power Unit
• Engine removal, cylinder head, timing chain, pistons
• Fuel System
• Fuel pump, injector testing, EFI pressure specs
• Ignition System
• Ignition coil checks, ECU outputs, spark plug info
• Cooling System
• Water passages, thermostat, impeller replacement
• Lower Unit
• Counter-rotation gearcase teardown, drive shaft service
• Electrical System
• Complete wiring diagrams, charging system, trim/tilt
• Troubleshooting
• Hard start, engine surging, overheat issues, fuel faults

💡 Also Includes Diagnostic Features:

• Yamaha Diagnostic System (YDS) usage instructions
• ECU fault code interpretation
• Live data display for EFI troubleshooting

💾 Format & Features:

• File Type: PDF
• Searchable: ✅ Yes
• Printable: ✅ Yes – Entire manual or individual chapters
• Device Compatibility: Windows, Mac, iOS, Android

🔍 Keywords:

Yamaha LF115B outboard service manual, 2014 2015 2016 2017, EFI repair guide, counter-rotation, marine maintenance, Yamaha repair PDF

❓ Mini FAQ:

Q: What does the “LF” mean in LF115B?
A: It refers to the left-hand (counter-rotating) model, specifically designed for twin-engine applications.

Q: Is this a genuine Yamaha service manual?
A: Yes – this is the official factory-issued repair guide for the LF115B.

Q: Will this work on my phone or tablet?
A: Absolutely – it’s a universal PDF that works across all platforms.

🧭 Helpful Resources for Yamaha Outboard Owners

• Why Every Yamaha Outboard Owner Should Own a Service Manual – Find out how a downloadable repair manual can simplify maintenance and help you troubleshoot common problems on your own.
• Outboard Engine Troubleshooter – Not sure what’s wrong with your Yamaha engine? Our free tool lists common issues and DIY fixes across all major brands.

🔧 Browse More Yamaha Manuals

Note: While our manuals are designed for DIY use, they do not replace professional mechanical training. If you're unsure about a repair or your engine shows serious issues, we strongly recommend visiting a certified marine mechanic. These guides are best suited for owners with basic to moderate mechanical experience.