Meet the reliable midrange rockstars

Midrange Four Strokes

Mechanical or Tiller: 115 hp, 90 hp, 75 hp

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.

Owners Manuals

View the 115 hp

View the 90 hp

View the 75 hp

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.

Power & Performance

Power and Efficiency

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.

Powerful Hole Shot

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.

Optimum Performance

A TCI microcomputer ignition adjusts timing to maintain optimal engine performance, economy and power under all operating conditions.

Lightweight, Compact Design

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.

Quick Acceleration

The F90 and F75 have stepped up to 1.8-liter displacement, joining their F115 big bro. Meanwhile the 90 hp and 75 hp have both dropped 13 pounds. Lighter weight and increased volumetric efficiency, plus increased displacement equals thrilling performance and make our 90 hp a top performer in acceleration and torque.

Reliability & Durability

Corrosion Protection

Combined with our proprietary alloy (YDC-30), our Phaze Five™ electro-deposited paint process provides a five-layer barrier against corrosion. Stainless Steel components such as the drive, prop and shift shafts provide an additional layer of critical corrosion protection. And multiple sacrificial anodes throughout the motor provide protection from the elements.

Convenience & Control

Multi-Function Tiller Handle

The F115 and all-new F90 and F75 are compatible with Yamaha’s award winning Multi-Function Tiller Handle. It incorporates engine start/stop, emergency stop, gear shift, power trim and tilt operation, variable trolling switch, warning and controls all in one.
Charging Power

The F115, F90 and F75 feature three-phase alternators that produce up to 35 amps of power. For the 90 and 75 hp, that’s 40 percent more output than previous designs, and for the 115, it’s more than 45 percent more charging power. That’s plenty of electrical power for battery charging and accessories, with more to spare.
Variable Trolling

The F115, F90 and F75 feature Yamaha’s Variable Trolling RPM Switch (VTS®). This allows for precision adjustment of trolling speeds in 50-RPM increments, from 650 to 900 RPM for the 115 hp, and 550 to 1000 RPM for the 90 and 75 hp. It even allows for sub-idle trolling. This is a major plus for anglers.
Extended Engine Life

A Freshwater Flush Device allows you to flush the engine without starting it, for maximum convenience, durability and engine life.

Product Videos:

Yamaha Midrange

Midrange 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.

Available for mechanical remote or tiller control
Only 377 pounds
Available in 20” or 25” shafts
Powerful 35-amp alternator
Optional Variable Trolling RPM via the Command Link^® tachometer

Controls

Gauges

Prop Selector

Midrange 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.

Available for mechanical remote or tiller control
Only 353 pounds
Available in 20” or 25” shafts
Powerful 35-amp alternator
Optional Variable Trolling RPM via the Command Link^® tachometer

Controls

Gauges

Prop Selector

Midrange 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.

Available for mechanical remote or tiller control
Only 353 pounds
20” shaft
Powerful 35-amp alternator
Optional Variable Trolling RPM via the Command Link^® tachometer

Controls

Gauges

Prop Selector

Specs & Compare

115 hp
90 hp
75 hp

Engine Comparison

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
Alternator Output	35 Amp
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°
Dry Weight	20" shaft / 171 kg (377 lbs), 25" shaft / 175 kg (386 lbs)
Mounting Centers	26"
Steering Angle (maximum)	35° from center, either direction
Warranty	Limited 3 Year Limited Pleasure Boat - 1 Year Limited Commercial

† Weight refers to shortest shaft length, and is measured without motor oil, gearcase oil and propeller (except models 25 hp and under, which include a standard propeller). All Jet model weights include the jet pump assembly (weight estimated).

Engine Comparison

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
Alternator Output	35 Amp
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°
Dry Weight	20" shaft / 160kg (353 lbs), 25" shaft / 164kg (363 lbs)
Mounting Centers	26"
Steering Angle (maximum)	35° from center, either direction
Warranty	Limited 3-year Pleasure, 3-year Government, 1-Year Commercial

Engine Comparison

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
Alternator Output	35 Amps
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°
Dry Weight	160 kg (353 lbs)
Mounting Centers	N/A
Steering Angle (maximum)	35° from center, either direction
Warranty	Limited 3-year Pleasure, 3-year Government, 1-Year Commercial

View Bulletins for all Models

Perf. Bulletins

115 hp
90 hp
75 hp

Manufacturer	PowerMatched	Boat Model	Engine	Configuration	Bulletin