(H1) 2018 Yamaha F115LB 1.8L I-4 | The Lightest 115-HP Outboard on the Water

Description

For over a decade, Yamaha has led the 115 horsepower four-stroke category, and the 2018 Yamaha F115LB represents the culmination of that expertise . Featuring a 1.8L inline-four with dual overhead camshafts and 16 valves, this outboard delivers exceptional power-to-weight performance—at just 377 pounds, it is the lightest DOHC 115-hp inline-four on the water, beating not only the competition but also Yamaha’s previous F115 design . The mechanical remote version, the “LB” designation, is purpose-built for center consoles and tiller-steered vessels that demand reliable, responsive power. To browse our complete inventory of new outboard motors, explore our showroom selection.

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(H2) Next-Generation Four-Stroke Engineering

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The F115LB’s 1.8L (1832cc) powerplant is a testament to Yamaha’s engineering excellence. With a bore increased from 79mm to 81mm and larger valves adopted for improved intake and exhaust transfer efficiency, this engine delivers more torque and responsiveness throughout the RPM range . The offset crankshaft design—positioned 5mm from the cylinder center—transfers power more efficiently to the crankshaft, reducing internal friction and enhancing durability .

The Multi-Point Electronic Fuel Injection (EFI) system injects precisely the right amount of fuel at the optimum timing, delivering “first-time, every-time” hot and cold starting, improved fuel efficiency, and excellent throttle response . Combined with a 10.0:1 compression ratio and TCI Microcomputer ignition, the F115LB delivers its rated 115 horsepower at 5500 RPM across a full operating range of 5300–6300 RPM . For those seeking additional value, our certified pre-owned outboard motors undergo rigorous inspection and offer warranty-backed confidence.

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(H3) Key Features & Technical Benefits

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Class-Leading Power-to-Weight
At just 377 pounds (dry weight for the 20-inch shaft model), the F115LB offers exceptional power-to-weight, making it ideal for a wide range of vessels from center consoles to pontoons . The 25-inch shaft variant weighs 386 pounds .

Advanced EFI with 81mm Cylinder Bore
The 1.8L displacement with an 81mm bore and 88.9mm stroke delivers robust torque across the power band . The 16-valve DOHC design ensures optimal volumetric efficiency .

Variable Trolling Control
Yamaha’s variable trolling control allows precise adjustment of idling speed from 600 to 1000 RPM in 50 RPM increments—a critical feature for anglers perfecting lure presentation when targeting different species .

High-Output 35-Amp Alternator
Provides ample charging power for electronics, livewells, and navigation equipment .

Single Ram Power Trim and Tilt
The compact and lightweight single ram PTT unit has been developed exclusively for this engine, providing precise trim control from -4° through +16° with a 70° tilt range .

Shift Dampener System (SDS)
Built into selected Yamaha propellers, this system delivers smooth and quiet operation when shifting in and out of gear by absorbing the force created during engagement .

Corrosion-Resistant Construction
Yamaha’s proprietary YDC-30 alloy combined with the Phaze Five™ electro-deposited paint process provides a five-layer barrier against corrosion . Stainless steel drive, prop, and shift shafts provide additional critical protection .

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(H2) Real-World Performance Data

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Yamaha’s rigorous performance testing on various hulls demonstrates the capability of the F115LB :

The Open 5.5 test achieved plane in just 2.91 seconds, demonstrating the F115LB’s exceptional hole shot capability . Performance data for the Godfrey Xperience shows efficient cruising at 3000 RPM (12.7 MPH) with 2.7 GPH fuel consumption, or 4.79 MPG .

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(H2) Technical Specifications

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This table provides a clear, scannable overview of the engine’s technical details based on manufacturer specifications .

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(H2) Recommended Companions

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To maximize the performance and longevity of your Yamaha F115LB, consider pairing it with these essential accessories, available through our propellers, fuel systems, and maintenance kits section:

• Yamaha 10-Micron Fuel/Water Separating Filter: Essential for protecting the EFI system from ethanol-related issues and water contamination .

• Yamalube® 4M Marine Engine Oil: The factory-recommended oil for optimal protection and performance .

• Yamaha Talon GP™ Propeller: Performance-matched propellers (available in aluminum and stainless steel) for maximum efficiency .

• Command Link® Gauge System: For real-time data on RPM, fuel economy, trim, and trolling speed adjustments .

• Y-COP Engine Immobilizer: Yamaha’s optional security system to prevent unauthorized start-ups .

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(H2) Popular Searches

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Customers who viewed the 2018 Yamaha F115LB are also searching for:

• Yamaha F115XB (counter-rotating version)

• Yamaha F90 and F75 midrange outboards

• Mercury 115 Pro XS four-stroke

• Suzuki DF115 outboard

• Yamaha F115LB service manuals and parts diagrams

• Center console outboard motor packages

For expert guidance on selecting the ideal engine for your vessel, consult the BoatUS Outboard Motor Buying Guide (nofollow), which offers comprehensive advice on matching outboard specifications to your specific boating needs.

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(H2) Service & Support at Aqua Marine Outboard

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Our commitment extends beyond just selling premium outboards. We are your full-service marine partner, and we make ownership accessible through our flexible financing options tailored to your budget. Our factory-trained technicians provide everything from routine maintenance and winterization to complex diagnostics and repairs.

Visit Our Showroom: Stop by at 1428 Wallace Ave, San Francisco, CA 94124 or call +1 (415) 882-6361 to speak with a marine specialist. For official documentation and to verify OEM specifications, you can also refer to the Yamaha Outboards Official Website (nofollow) and the Yamaha Genuine Parts & Accessories (nofollow) pages.

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(H2) Frequently Asked Questions (FAQ)

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Q: What does the “LB” designation mean on the Yamaha F115LB?
A: The “LB” indicates this is the mechanical remote control version with a 20-inch shaft. This model is designed for tiller-steered vessels and center consoles that utilize mechanical controls .

Q: What is the dry weight of the 2018 Yamaha F115LB?
A: The 20-inch shaft model weighs 377 pounds (171 kg), making it the lightest DOHC 115-hp inline-four on the water . The 25-inch shaft model weighs 386 pounds .

Q: Is the F115LB compatible with Yamaha’s Command Link gauges?
A: Yes, the F115LB is Command Link compatible, allowing you to display real-time data including RPM, fuel flow, fuel economy, trim level, battery voltage, and variable trolling speed adjustments .

Q: What is the ethanol limit for this engine?
A: Yamaha recommends a maximum ethanol blend of 10% for this EFI engine. Using an external Yamaha 10-Micron Fuel/Water Separating Filter is strongly advised to protect the fuel system .

Q: Does the F115LB offer counter-rotating propeller options?
A: Yes, Yamaha offers a counter-rotating propeller option for twin-engine setups, ensuring the vessel maintains a “neutral helm” at any speed . The counter-rotating version is designated as the F115XB.

Q: What is Variable Trolling Control and how does it work?
A: Variable Trolling Control allows the skipper to precisely adjust the engine’s idling speed from 600 to 1000 RPM in 50 RPM increments via the Command Link tachometer . This feature enables fishermen to fine-tune their lure presentation when targeting different species .