Mercury 90HP FourStroke EFI Outboard Motor – 20″/25″ Shaft, Electric Start & SmartCraft

Take your boating experience to the next level with the Mercury 90HP FourStroke EFI Outboard Motor, a powerful and fuel-efficient engine engineered to deliver exceptional performance, reliability, and smooth operation. Whether you’re powering a fishing boat, center console, aluminum boat, pontoon, or commercial vessel, this Mercury FourStroke is built to provide dependable power in both freshwater and saltwater environments.

Powered by a 2.1L Inline 4-cylinder SOHC engine, the Mercury 90HP produces strong acceleration, excellent mid-range torque, and outstanding fuel economy. Its advanced Multi-Port Electronic Fuel Injection (EFI) system ensures instant starts, smooth throttle response, and optimized fuel efficiency while reducing emissions.

Designed with Mercury’s latest technology, this outboard features SmartCraft® ECM 70 Digital Inductive Ignition and SmartCraft Engine Guardian, which continuously monitor engine performance and help protect critical components. The engine is fully compatible with SmartCraft digital gauges, giving you real-time access to engine diagnostics, fuel management, maintenance reminders, and performance data.

The Mercury 90HP offers flexible steering options, including Big Tiller compatibility, dual-cable mechanical steering, and hydraulic power steering, making it suitable for a wide range of boating applications. Equipped with Power Trim and Tilt, operators can easily optimize engine angle for improved performance, efficiency, and shallow-water operation.

Built with Mercury’s renowned corrosion protection and premium Phantom Black finish, this outboard is engineered to withstand harsh marine environments while maintaining long-lasting durability and outstanding appearance.

When you purchase from EZ Boats Marine, you’re investing in genuine Mercury outboard motors backed by expert customer support, competitive pricing, and worldwide shipping. Our experienced marine specialists are ready to assist with compatibility verification and help you select the ideal engine for your boat.

Key Features

• Brand new Mercury 90HP FourStroke EFI outboard motor
• Powerful 2.1L Inline 4-cylinder SOHC engine
• Multi-Port Electronic Fuel Injection (EFI)
• 90 horsepower output
• Smart Start electric starting system
• SmartCraft® Engine Guardian protection
• SmartCraft® digital technology compatible
• Available with 20-inch or 25-inch shaft
• Power Trim and Tilt
• Big Tiller, mechanical, or hydraulic steering compatibility
• Performance-Tuned Scroll Intake Manifold
• Water-cooled with thermostat
• Through-prop exhaust system
• Premium Phantom Black finish
• Ideal for fishing boats, pontoons, center consoles, aluminum boats, and commercial vessels
• 3-Year Manufacturer Warranty

Technical Specifications

• Brand: Mercury Marine
• Model: FourStroke 90HP
• Part Number: 1F904132D
• Engine Type: Inline 4-Cylinder SOHC Four-Stroke
• Horsepower: 90 HP (67 kW)
• Displacement: 2.1 Liters
• Fuel System: Multi-Port Electronic Fuel Injection (EFI)
• Starting System: Smart Start Electric
• Full Throttle Range: 5,000–6,000 RPM
• Gear Ratio: 2.07:1
• Steering Options: Big Tiller, Mechanical, Hydraulic
• Shaft Lengths: 20″ or 25″
• Alternator Output: 35 Amp (441 Watts)
• Oil Capacity: 5.5 Quarts (5.2 Liters)
• Dry Weight: 359 lbs (163 kg)
• Cooling System: Water-Cooled with Thermostat
• Recommended Fuel: 87 Octane (Maximum 10% Ethanol)
• Recommended Oil: Mercury FourStroke 10W-30