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2015 Mercury 90 HP EFI FourStroke Outboard

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About the 2015 Mercury 90 HP EFI FourStroke Outboard

Built-In Durability

Every 75-115 horsepower Mercury FourStroke is built to deliver long-term reliable performance. Our fully filtered air intake protects internal engine components from potentially damaging dust and sand, while our advanced antidrainback oil system assures instant lubrication on start-up. In addition, the use of shared Verado components ensures the ultimate in mechanical toughness and reliability.

Maintenance-Free Valve Train

The 75-115hp FourStroke models feature the same valve train architecture as Verado – a robust design that is incredibly durable and maintenance-free for life.

Superior Corrosion Protection

Mercury FourStrokes deliver powerful saltwater protection by using stainless steel components, hard anodizing, engineered polymers, and an exclusive multistep painting and coating process. Saltwater maintenance is made easy in the 75-115hp models with the innovative freshwater flush. And only Mercury offers a three-year limited corrosion failure warranty.


Engine Configuration:Single Outboard
Engine Description:90 HP EFI FourStroke Outboard
Total or Max HP:90

90 EFI FourStroke Specifications

HP/Kw @ Prop 90 / 67
Full throttle RPM 5000-6000
Cylinder Configuration 4 (in-line)
Displacement (CID / CC) 105.7 / 1732
Bore and Stroke (in / mm) 3.23 x 3.23in
82 x 82mm
Fuel Induction System 4 valves per cylinder, dual overhead cam (DOHC)
Ignition ECM 07 Digital Inductive
Fuel System Electronic Fuel Injection (EFI)
Alternator Amp 50 amp / 630 watt
Cooling System Water-cooled with thermostat
Starting Electric (turn-key)
Gearcase Ratio 2.33:1
Gear Shift F-N-R
Steering Big Tiller Compatible
Tiller Kit
Trim System Power Trim
Exhaust System Though prop
Shallow water trim range (degrees) 20
Recommended Oil Mercury 4-Stroke Outboard Oil
Recommended Fuel 87 octane/up to 10% ethanol
Remote fuel tank optional Yes
Engine Protection Operator Warning System SmartCraft Engine Guardian
Compatible with Smartcraft Digital Technology Yes
Shaft Length 20 in (508 mm)
25 in (635mm)
Dry Weight * Lightest model available 399lbs / 181kg
CARB Star Rating 3