2018 Yamaha F115XB 1.8L I-4 | Counter-Rotating Power for Twin-Engine Excellence

Description

The 2018 Yamaha F115XB represents a specialized evolution of Yamaha’s acclaimed 115hp four-stroke platform. Where the standard F115 delivers exceptional single-engine performance, the “XB” designation signals something unique: counter-rotation. This outboard is purpose-built to rotate in the opposite direction of a standard propeller, making it the ideal partner in twin-engine configurations where propeller torque steer must be eliminated for neutral helm control at any speed . Featuring the same 1.8L inline-four with dual overhead camshafts and 16 valves, the F115XB delivers 115 horsepower at just 386 pounds—a remarkable power-to-weight ratio for a 25-inch shaft counter-rotating outboard . To browse our complete inventory of new outboard motors, explore our showroom selection.

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(H2) Engineered for Twin-Engine Symmetry

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The F115XB shares its foundation with the standard F115—the 1.8L (1832cc / 109.8 ci) powerplant with an 81mm bore and 88.9mm stroke, delivering a 10.0:1 compression ratio and a full throttle operating range of 5300–6300 RPM . The difference lies in the gearcase: the F115XB features a counter-rotating propeller shaft, allowing the engine to spin in the opposite direction to its standard counterpart . This is essential for twin-engine installations, as it cancels out the natural torque that would otherwise cause the vessel to pull to one side, resulting in a “neutral helm” at any speed .

The Multi-Point Electronic Fuel Injection (EFI) system, combined with 16-valve DOHC architecture and a 75mm throttle body, delivers “first-time, every-time” hot and cold starting, improved fuel efficiency, and excellent throttle response . The TCI Microcomputer ignition adjusts timing to maintain optimal engine performance, economy, and power under all operating conditions . 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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Counter-Rotating Capability
The defining feature of the F115XB. When paired with a standard-rotation F115, the counter-rotating propeller neutralizes torque steer, providing precise tracking and effortless helm control at any speed . This is particularly valuable for center console and offshore vessels where helm balance is critical.

Class-Leading Power-to-Weight
At just 386 pounds (dry weight for the 25-inch shaft model), the F115XB offers exceptional power-to-weight, making it ideal for twin-engine installations where weight distribution is critical .

Advanced 1.8L DOHC 16-Valve Architecture
The 1832cc displacement with dual overhead camshafts and four valves per cylinder delivers robust torque across the power band. New intake and exhaust valves, independently controlled by two camshafts, greatly improve breathing efficiency .

Variable Trolling System (VTS)
Yamaha’s variable trolling system allows precise adjustment of idling speed from 600 to 1000 RPM in 50 RPM increments via the Command Link tachometer—a critical feature for anglers perfecting lure presentation .

High-Output 35-Amp Alternator
Provides ample charging power for electronics, livewells, and navigation equipment, even after long periods at low RPM .

Power Trim and Tilt
Standard power trim and tilt provides precise control with a 25-inch shaft length for deeper water applications .

Shift Dampener System (SDS) Compatibility
Yamaha’s patent-pending SDS greatly reduces the noise commonly associated with shifting gears, absorbing much of the force of engagement for smooth and quiet operation .

Command Link and Y-COP Compatibility
The F115XB is fully compatible with Yamaha’s Command Link gauge system for real-time data display and the Y-COP engine immobilizer for enhanced security .

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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 F115XB in twin-engine configurations :

Twin Engine – World Cat 230 CC :

• 0-30 MPH: 5.99 seconds

• Test Configuration: Twin F115XB engines, 25″ shafts, counter-rotating propellers

• Test Weight: 96 gallons fuel, 2 batteries, 2 people, 30 lbs safety gear

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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 F115XB, 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 SS™ Propeller: Performance-matched stainless steel propellers tested on the World Cat 230 CC twin configuration (13-1/8″ x 16) 

• 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 F115XB are also searching for:

• Yamaha F115LB (standard rotation 25″ shaft)

• Yamaha LF115XB (counter-rotation with extra-long shaft)

• Yamaha VF115 VMAX SHO (high-performance lightweight variant) 

• Mercury 115 Pro XS four-stroke

• Twin-engine outboard packages

• Center console twin-engine setups

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 “XB” designation mean on the Yamaha F115?
A: The “XB” indicates this is the counter-rotating version of the F115, designed for twin-engine installations. When paired with a standard-rotation F115, the XB’s counter-rotating propeller neutralizes torque steer, providing a “neutral helm” at any speed .

Q: What is the dry weight of the 2018 Yamaha F115XB?
A: The 25-inch shaft model weighs 386 pounds (175 kg), making it exceptionally lightweight for a counter-rotating 115hp four-stroke .

Q: Is the F115XB compatible with Yamaha’s Command Link gauges?
A: Yes, the F115XB 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: What is Variable Trolling System (VTS) and how does it work?
A: VTS 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.

Q: Can the F115XB be used as a single-engine application?
A: While the F115XB can be used as a single engine, its primary design purpose is for twin-engine installations where counter-rotation is required to eliminate torque steer. For single-engine applications, the standard F115 (non-XB) is typically recommended.