The In-Line Four V MAX SHO four strokes have achieved the unthinkable—packing signature V MAX SHO hole shot and acceleration into streamlined designs. This powerful family now includes the all-new I-4 V MAX SHO 90, which packs the biggest punch of any 90-horse on the water. Overall, this series of 1.8- and 2.8-liter dynamos features a surprising tech package with 16 valves, single- or double-overhead cams and electronic fuel injection—for maximum efficiency and high performance. This makes the I-4 V MAX SHOs perfect for smaller bass, flats and bay boats and other performance hulls. With the option of a 25-inch shaft for all of our I-4 V MAX SHO outboards, anglers prowling big waters on multi-species, bay and flats boats have a competitive edge that runs deeper than ever.

Power & Performance* Quiet Power and Performance: The I-4 V MAX SHO® design maximizes combustion efficiency in a way that no two stroke can, delivering clean, quiet power and performance.
* Midrange Power and Response: The V MAX SHO® 175 and 150 feature Variable Camshaft Timing, which optimizes the angle of the intake camshaft to increase power and throttle response in the low- and mid-RPM ranges.
* Fuel Efficient: In-line Four V MAX SHO® designs are up to 40% more fuel efficient than traditional carbureted two strokes.
* Optimum Power: Precision Multi-Point Electronic Fuel Injection and long-track intake system combine to maximize power and fuel efficiency across the line of In-Line Four V MAX SHO® outboards.
* Power Management: An array of advanced sensors constantly provide vital atmospheric and engine conditions to the Engine Control Module (ECM), which instantly makes the precise adjustments for optimum performance.

Reliability & Durability* Unbeatable Reliability: The I-4 V MAX SHO® 175 and 150 feature a Cowling Drain System and Air Intake Labyrinth System to trap and drain water that enters their cowlings during normal operation.
* Better Lubrication: Wet sump pump lubrication that uses a pressurized oil delivery system through an oil pump.
* Engine Warning System: This system protects the outboard with a range of functions including: overheat protection and low-oil-pressure warning (automatically reducing maximum RPM to 2000), over-rev protection, water-in-fuel detection, start-in-gear protection and shift-in prevention at open throttle.
* Corrosion Protection: Combined with our proprietary alloy (YDC-30), our exclusive Phaze Five™ electro-deposited, anti-corrosive paint system provides a tough, five-layer barrier against corrosion. This protection is standard on all Yamaha I-4 V MAX SHO® four-stroke engines.

Convenience & Control* Extra Space: A four stroke in-line design means there's no need for an external oil tank. That means less weight and more storage room in the boat for tackle and gear.
* Ample Charging Power: At 50 amps, the V MAX SHO® 175 and 150 alternators boast an 11 percent increase in charging power over the two stroke 150 HPDI®.
* Easy Rigging: I-4 V MAX SHO® outboards feature mechanical controls for easy, convenient rigging with most bass, bay and flats boats, and are compatible with analog, 6Y5 digital or Command Link® gauges.

Model Specific Features* The I-4 V MAX SHO 115 is Yamaha’s fastest 115-hp four stroke, ever, with a top speed of nearly 51 mph.\* On top of its impressive speed, it features tech unheard of in its class, including a long-track intake system, free-flow exhaust and knock sensor. Still it’s 10 pounds lighter than a competitor’s two stroke. (\*Tests conducted by Yamaha Marine using a Skeeter® TZX170 with a tournament load and two occupants.)
* 1.8-liter high-output four cylinder
* 377 lbs. dry weight
* 20-inch and 25-inch shaft options
* 35 amps of charging power
* Command Link® compatibility with Variable Trolling

Specifications* 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\*: 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: 3.2L/3.0L
* Recommended Cooling: Thermostatic Control
* Ethanol Blend Limit: 10% Maximum
* Gear Ratio: 2.15:1
* Gear Shift: Forward, Neutral, Reverse
* Shaft Length: 25"
* Degree of Tilt: 70°
* Degree of Trim: -4° through +16°
* Dry Weight: 25" shaft / 175 kg (386 lbs)
* Mounting Centers: N/A
* Steering Angle (maximum): 35° from center, either direction
* Warranty: Limited 3-Year Pleasure, 3-Year Government, 1-Year Commercial
NOTES: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).
The In-Line Four V MAX SHO four strokes have achieved the unthinkable—packing signature V MAX SHO hole shot and acceleration into streamlined designs. This powerful family now includes the all-new I-4 V MAX SHO 90, which packs the biggest punch of any 90-horse on the water. Overall, this series of 1.8- and 2.8-liter dynamos features a surprising tech package with 16 valves, single- or double-overhead cams and electronic fuel injection—for maximum efficiency and high performance. This makes the I-4 V MAX SHOs perfect for smaller bass, flats and bay boats and other performance hulls. With the option of a 25-inch shaft for all of our I-4 V MAX SHO outboards, anglers prowling big waters on multi-species, bay and flats boats have a competitive edge that runs deeper than ever.

2021 Yamaha 115HP - 25" Shaft - V MAX SHO 1.8L

Specifications

Manufacturer specifications

Description

Warranty