2025 Mercury 25hp 4-Stroke Outboard Specifications

General

• Model: Mercury 25 hp FourStroke EFI Outboard 

• Engine Type: Inline-3, 4-stroke with EFI (Electronic Fuel Injection)

• Horsepower: 25 hp (18.4 kW)

• Displacement: 30.5 CID / 500 cc (≈ 526 cc)

• Cylinders: 3

• Fuel System: EFI – battery-free EFI on manual start or electric start setups

• Coolant System: Water-cooled with thermostat

• Ignition: CDI with electronic spark advance

Performance & Operation

• Full Throttle RPM: ~5,000–6,000 rpm

• Gear Ratio: ~1.92:1

• Steering: Tiller or remote (depending on model/option)

• Gear Shift: F-N-R (Forward-Neutral-Reverse)

Dimensions & Weight

• Shaft Length Options:
  • 15″ (Short) — common on 25EH EFI
  • 20″ (Long) — common on 25ELH & similar variants

• Dry Weight: Depending on configuration:
  • ~132 lb / 60 kg (lightest configurations)
  • ~171 lb (78 kg) typical for long shaft tiller versions

Electrical & Accessories

• Alternator Output: ~17 amp / 210 W (electric start models)

• Engine Protection:
  • Low oil pressure alert
  • Over-rev protection
  • Overheat warning
  • Sensor failure alert

Controls & Features

• Trim & Tilt: Manual or power trim & tilt (depending on option)

• Steering Options: Tiller steer standard; remote available

• Tiller Handle: Multi-function on tiller models (controls throttle, shift, steering)

• SmartCraft Compatible: Yes (with electric start models)

Fuel & Tank

• External Fuel Tank: Typically supplied (6.6 gal / 25 L) with portable models