Midrange 1.8 L

The Yamaha 115 hp and the all-new 90 hp and 75 hp Midrange four strokes are reliable inshore performers. Fast and powerful, they sport 1.8-liter displacement and DOHC or SOHC designs with four valves per cylinder. This gives them exceptional volumetric efficiency and lighter weights. With 25-inch shaft options for the F115 and F90, this horsepower range offers prime power for mid-size craft, including anglers trolling large, rough water in 25-inch-transom multi-species boats. The completely surprising Yamaha Midrange 115, 90 and 75 hp four strokes. A powerful part of our lineup—and your boating experience.
Precision Multi-Point Electronic Fuel Injection delivers the exact amount of fuel needed for optimum performance and efficiency. Yamaha’s EFI optimizes fuel atomization further enhancing fuel economy.
The Composite Intake Manifold on the F115, F90 and F75 feature long tube intake tracks, tuned to increase airflow, which boost 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 smooth, quiet operation.
To keep weight down and efficiency up, the F115 has a double overhead camshaft, and the F90 and F75 feature a single overhead camshaft, but still deploy four valves per cylinder. That setup means less mass in the cylinder head and reduced weight for the overall outboard. At the same time, four valves per cylinder means great engine combustion, which contributes to horsepower, torque and fuel efficiency.

Texas Marine OUTBOARDS

IMPRESSIVE TORQUE & ACCELERATION

The all-new F90 and F75 Midrange four strokes have stepped up to 1.8L displacement and now feature a Single Overhead Camshaft, with four valves per cylinder. That makes them both 13 pounds lighter, and our 90 hp a top performer in both torque and acceleration.

Texas Marine OUTBOARDS

Midrange 1.8 L Specs

  • 115 HP

    Our 1.8-liter I-4 F115 features a double overhead camshaft with four valves per cylinder. This increases volumetric efficiency and gives the F115 a competitive power to weight.

    Engine Type Inline 4
    Displacement 1.8L
    Bore x Stroke 81 x 88.9mm |3.19 x 3.5in
    Prop Shaft Horsepower 115hp at 5500 rpm
    Full Throttle RPM Range 5300 ~ 6300
    Alternator Output at W.O.T. 35 Amp
    Compression Ratio 10.0:1
    Fuel Induction System EFI
    Weight † 171 kg (377 lbs) – 175 kg (386 lbs)
    Recommended Fuel Octane 87
    Recommended Engine Oil Yamalube® 4M / (See owner’s manual)
    Recommended Fuel Filtration Yamaha 10-Micron Fuel / Water Separating Filter (external)
    C.A.R.B. Rating 3-Star
    Exhaust Through Propeller
    Intake 16
    Ignition TCI Microcomputer
    Spark Plug LKR6E
    Starting System Electric
    Lubrication Wet Sump
    Engine Oil Capacity 3.2/3.0L
    Recommended Cooling Thermostatic Control
    Ethanol Blend Limit 10% Maximum
    Gear Ratio 2.15:1
    Gear Shift Forward, Neutral, Reverse
    Shaft Length 20″ – 25″
    Degree of Tilt 70°
    Degree of Trim -4° through +16°
    Mounting Centers 26″
    Steering
    Steering Angle (maximum) 35° from center, either direction
    Warranty Limited 3 Year Limited Pleasure Boat – 1 Year Limited Commercial
  • 90 HP

    The all-new 1.8-liter I-4 F90 features greater displacement and a single-overhead-camshaft design with four valves per cylinder. This boosts power and volumetric efficiency, streamlines design, and makes the F90 a leader in torque and acceleration.

    Engine Type Inline 4
    Displacement 1.8L
    Bore x Stroke 81 x 88.9mm (3.19 x 3.5 in)
    Prop Shaft Horsepower 90hp @ 5500 rpm
    Full Throttle RPM Range 5000 ~ 6000
    Alternator Output at W.O.T. 35 Amp
    Compression Ratio 10.0:1
    Fuel Induction System EFI
    Weight † 160kg (353 lbs) – 164kg (362 lbs)
    Recommended Fuel Octane 87
    Recommended Engine Oil Yamalube® 4M (See owner’s manual)
    Recommended Fuel Filtration Yamaha 10-Micron Fuel/Water Separating Filter (external)
    C.A.R.B. Rating 3-Star
    Exhaust Through Propeller
    Intake 16
    Ignition TCI Microcomputer
    Spark Plug LFR6A-11
    Starting System Electric
    Lubrication Wet Sump
    Engine Oil Capacity 3.2/3.0L
    Recommended Cooling Thermostatic Control
    Ethanol Blend Limit 10% Maximum
    Gear Ratio 2.15:1
    Gear Shift Forward, Neutral, Reverse
    Shaft Length 20″ – 25″
    Degree of Tilt 70
    Degree of Trim -4° through +66°
    Mounting Centers 26″
    Steering
    Steering Angle (maximum) 35° from center, either direction
    Warranty Limited 3-year Pleasure, 3-year Government, 1-Year Commercial
  • 75 HP

    The all-new 1.8-liter I-4 F75 features a step up in displacement from its previous design. Still, its single-overhead-camshaft with four valves per cylinder keeps it compact and shaves off 13 pounds. Bigger power plus lighter weight equals one thrilling new outboard.

    Engine Type Inline 4
    Displacement 1.8L
    Bore x Stroke 81 x 88.9mm (3.19 x 3.5in)
    Prop Shaft Horsepower 75hp at 5500 rpm
    Full Throttle RPM Range 5000 ~ 6000 rpm
    Alternator Output at W.O.T. 35 Amp
    Compression Ratio 10.0:1
    Fuel Induction System EFI
    Weight † 160 kg (353 lbs)
    Recommended Fuel Octane 87
    Recommended Engine Oil Yamalube® 4M (See owner’s manual)
    Recommended Fuel Filtration Yamaha 10-Micron Fuel/Water Separating Filter (external)
    C.A.R.B. Rating 3-Star
    Exhaust Through Propeller
    Intake 16
    Ignition TCI Microcomputer
    Spark Plug LFR6A-11
    Starting System Electric
    Lubrication Wet Sump
    Engine Oil Capacity 3.2/3.0L
    Recommended Cooling Thermostatic Control
    Ethanol Blend Limit 10% Maximum
    Gear Ratio 2.15:1
    Gear Shift Forward, Neutral, Reverse
    Shaft Length 20″
    Degree of Tilt 70°
    Degree of Trim -4° through +16°
    Mounting Centers N/A
    Steering
    Steering Angle (maximum) 35° from center, either direction
    Warranty Limited 3-year Pleasure, 3-year Government, 1-Year Commercial

Interested In A Midrange 1.8 L?

Texas Marine is your premier destination for Yamaha Outboard Engines. Discover the power, reliability, and innovation of Yamaha’s world-renowned marine engines right here. Whether you’re a seasoned boater or a newcomer to the water, our expert team is dedicated to helping you find the perfect Yamaha Outboard Engine to suit your needs.

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