2025 Mercury Marine® FourStroke 40 EFI Base
- Year 2025
- Make Mercury Marine®
- Model FourStroke 40 EFI
2025 Mercury Marine® FourStroke 40 EFI Base
2025 Mercury Marine® FourStroke 40 EFI
Held to a Higher Standard.There are plenty of good reasons these outboards rule the water. Start with no-worry reliability. More low-end torque for excellent acceleration. Increased fuel economy and outstanding overall performance. Enhanced fuel injection (EFI models) for boosted efficiency. A robust electrical system with a high-output alternator to keep batteries charged and fishing electronics humming. They have everything you need, and nothing you don't.
Mercury EFI outboards deliver reliable turnkey starts, improved fuel efficiency, and instant throttle response.
Engine
Engine Power
40 HP (30 KW)
Engine Type
Inline 3
Displacement
45.6 CID (747 CC)
Throttle
Full: 5500-6000 RPM
Oil Type
Recommended: Mercury FourStroke 25W40 Marine Oil
Gear Ratio (Primary)
2.00:1 | Shift: F-N-R
Emissions
CARB star rating: 3
Lubrication
System: Wet sump
Bore
2.56" (65 mm)
Stroke
2.95" (75 mm)
Ignition
ECM 70
Steering
Remote | Tiller
Cooling
Water-cooled with thermostat
Exhaust
Through prop
Operational
Operating Conditions
Shallow water trim range (degrees): 20°
Electric
Alternator
18 amp (226 watt)
Starter
Electric (turn-key)
Fuel System
Fuel System
induction: 2 valves per cylinder, single overhead cam (SOHC) | Electronic Fuel Injection (EFI)
Fuel Type
Recommended: 87 octane / up to 10% ethanol
Dimensions
Length
Shaft: 15" (381 mm) | 20" (508 mm)
Weights
Dry Weight
Lightest model available: 204 lbs (93 kg)
Features
Features
Engine protection operator warning system: Low oil pressure/Over-rev/Overheat | Compatible with SmartCraft digital technology: Yes | Trim system: Gas assist/Power Tilt/Power Trim
Color
Colors
Phantom Black