In-Line Four

POWER + Versatility + Reliability


You’re here to wake up the water. Count on Yamaha’s reliable In-Line four strokes to power the fun. Our in-line four-cylinder designs and electronic fuel injection make these babies strong, nimble, compact and light weight. In other words, they’re up for anything, making them the perfect power for cruising, skiing and sport fishing on flats, decks and offshore boats, and pontoons or deep-V hulls.


In-Line Four Models: F150 | F115


Here are just a few of the reasons why these versatile dynamos have been Yamaha’s bestseller, several years running:  

Amazing Acceleration
A 10mm offset crankshaft helps provides greater intake volume, and four tuned intake tracks increase low-and mid-range torque, boosting acceleration.

A 16-valve Double Overhead Cam maximizes power by using four valves per cylinder, eliminating rocker arms and their adjustments and increasing air supply and volumetric efficiency for better performance.

Exceptional Performance
Electronic fuel injection is controlled by the Engine Control Module. It continually adjusts the fuel/air mix to properly match engine load and speed.

Minimized Vibration
Twin counter balancer shafts on the F150 minimize engine vibration for a smooth, pleasant boating experience.

Engine Type In-Line Four Cylinder
Displacement 162.8 ci (2670 cc)
Bore x Stroke 94.0 x 96.2mm (3.70 x 3.79 in)
Prop Shaft Horsepower 150 hp @ 5500 rpm
Compression Ratio 9.0:1
Fuel/Induction System EFI (DOHC)
Exhaust Through Propeller
Intake Four Individual Throttle Valves
Ignition System TCI Micro Computer
Spark Plug LFR5A-11-00-000
Alternator Output 35 AMP
Starting System Electric
Lubrication Wet Sump
Engine Oil Capacity 4.5L/4.3L w/without filter
Full Throttle RPM Range 5000 – 6000
Cooling Water/Thermostatic Control
Recommended Engine Oil Yamalube® 4M (See owner’s manual)
Recommended Fuel Regular Unleaded (Minimum Pump Octane 87)
Recommended Fuel Filtration Yamaha 10 Micron Fuel/Water Separating Filter (external)
Ethanol Blend Limit 10% Maximum
Gear Ratio (28:14) 2.00:1
Gear Shift Forward, Neutral, Reverse
Shaft Length L = 20″ X = 25″
Degree of Tilt 70°
Degree of Trim -4 through 16°
C.A.R.B. Rating 3-Star
Dry Weight F150LA = 218 kg (480lbs) F150XA = 223 kg (491 lbs)
Mounting Centers TBD
Steering Angle (maximum) 35° from center, either direction
Warranty 3 Year Limited Pleasure Boat – 1 Year Limited Commercial
Power/Performance F150 F115
Four Stroke Engine Design S S
Powerful 4-Cylinder 163 cu in. S
Compact 10mm Offset Crankshaft S
Large Volume Air Intake S
Precision Multi-Point Fuel Injection S S
DOHC (Double Overhead Camshaft) S S
4-Valves Per Cylinder S S
Long Track Induction System S S
4-individual Throttle Valves S
Compact, Lightweight Design S S
Labyrinth Exhaust S S
4-1 Exhaust System S
Twin Balancer Shafts S
Flywheel Dampener S
Powerful 4-Cylinder 106 cu in. S
Front Air Intakes S
Single Throttle Valve S
Reliability/Durability F150 F115
TCI Microcomputer S S
Direct Drive System S S
Wet Sump Lubrication S S
Engine Warning System S S
Sacrificial Anodes S S
YDC-30 Aluminum Alloy S S
ACP-221 Paint Process S S
Electro-deposited Powerhead Paint Process S S
Top Mounted Electrical S S
Forged Pistons S S
Super Tight Cowling Mounting S
Heat Treated Gears S
High Output Alternator S
SST Drive, Prop, Shift Shafts S S
SST Steering Tube S S
Magnetic Drain Plug S S
Cowling Air Intake Water Draining System S
Water-cooled Fuel Rail S S
Convenience/Control F150 F115
Power Trim and Tilt S S
Freshwater Flush S S
Easy Maintenance
Counter Rotation “LF” Model
Yamaha Diagnostic System C C
Single Belt Drive System S
Long Oil Dip Stick Tube S
Reversible PTT Switch S
Multi Charge Monitoring System S
Self-Draining Oil Filter S
External Tilt Switch S
New Style Rigging Grommet S



Smart Design

Compact and lightweight, our in-line four-cylinder design is quiet, clean-burning and fuel efficient, with power to spare.

Power & Efficiency

A 16-Valve Double Overhead Cam with individual intake and exhaust camshafts provides more precise valve timing control and has less moving parts for less maintenance. This superior design also allows for use of four compact valves per cylinder, which exchanges intake and exhaust gases more efficiently for better power and increased fuel economy.

Fuel Economy

Multi-Point Electronic Fuel Injection is controlled by the ECM (Engine Control Module). Four individual fuel injectors provide the precise amount of fuel for each individual cylinder. Optimal fuel atomization provides better combustion, further enhancing performance and fuel economy.


A 10mm Offset Crankshaft allows for larger intake volume design. Four tuned intake tubes boost torque in low and mid-speed ranges for quick acceleration.

Powerful Hole Shot

The Composite Intake Manifold is a lightweight, compact design, making these engines very versatile. Long Tube Intake Tracks are tuned to increase airflow, boosting low-end and midrange torque. This means a more powerful hole shot and increased acceleration. Even with all this responsive power, an air silencer box and surge tank reduce air intake noise and air turbulence for smoother operation.

Optimum Overall Performance

Microcomputer Ignition adjusts timing to maintain optimum engine performance, economy and power under all operating conditions.

Ultra-Low Emissions

All Yamaha In-Line Four strokes are California Air Resources Board (C.A.R.B.) Three-Star Rated for Ultra-Low Emissions and meet all federal EPA requirements.



Corrosion Resistance

Our exclusive ACP-221 Paint Process provides a tough, five-layer barrier against corrosion. It’s a key part of our renowned Ultimate Corrosion Protection System that’s standard on all Yamaha Inline four stroke engines.

Warranty Protection

All Yamaha four strokes are protected by our Three-Year Limited Warranty for pleasure use. Beyond that, Yamaha Extended Service (Y.E.S.) plans are available, for continued coverage after your three-year factory warranty expires.

Anti-Corrosive Barrier

Our exclusive YDC-30 Alloy is the most corrosion-resistant base material in the industry. Used with our proprietary ACP-221 Paint Process, it provides an extra-tough barrier against corrosion. These measures are both key components of our renowned Ultimate Corrosion Protection System, which is standard on all Yamaha inline four strokes.



Smooth Operation

Unique Twin Counter Balancer Shafts counteract vibration normally associated with internal moving parts for smooth operation and a pleasant boating experience.

Fewer Fill-ups

Yamaha’s In-Line Four strokes blend fuel economy with power and performance.

Warranty Protection

All Yamaha four strokes are protected by our Three-Year Limited Warranty for pleasure use. Beyond that, Yamaha Extended Service (Y.E.S.) plans are available, for continued coverage after your three-year factory warranty expires.

Extended Trim

Extended Trim Range delivers better acceleration-to-plane and top-end speed. The tilt range is a full 70° for tilting the engine above the waterline.

Easy Engine Flushing

A Freshwater Flush Device allows you to flush the engine without running it, for added convenience and extended engine life.