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Innovating the industry with battery-free power.
Mercury FourStrokes have long led the pack in clean, quiet, fuel-efficient outboard power, and now the gap grows even wider. We combined innovative engineering with advanced reliability and features to make our outboards run clean, stay quiet, and deliver smooth, responsive performance – all while cutting your fuel and maintenance costs.
The 25 and 30hp FourStrokes have an industry-first battery-less EFI system for easier starting, smooth running, and improved efficiency. That’s not a misprint – they feature electronic fuel injection with no battery.
RELIABILITY
Consistent Starting
Mercury FourStroke EFI outboards deliver consistent, easy starts, smooth operation, and reliability. The 25 and 30hp models are the industry's first batteryless EFI outboards.
PERFORMANCE
Born To Be Smooth
All portable and mid-range Mercury FourStrokes feature inline designs for inherently smooth operation.
Powerful 3-Cylinder Design
Every 25 and 30hp Mercury Fourstroke utilize a three-cylinder engine design that delivers better inherent balance than the twin cylinder designs used by competitive outboards. Mercury’s three cylinder approach results in a smoother and quieter user experience.
EASE-OF-USE
Fun at your Fingertips
Mercury Fourstrokes are designed with a boat load of user-friendly features, such as our multifunction tiller handle. Available on gas assist or power trim models, this tiller handle gives you easy one-handed operation of shifting, stopping, throttle, tilt and starting. More control equals better maneuverability.
25 EFI Specifications
| HP/kW | 25 / 18.6 |
|---|---|
| Full throttle RPM | 5000-6000 |
| Cylinder Configuration | I-3 |
| Displacement (CID / CC) | 32.1 / 526 |
| Bore and Stroke (in / mm) | 2.40 x 2.36in 61 x 60mm |
| Fuel Induction System | 2 valves per cylinder, single overhead cam (SOHC) |
| Ignition | CDI w/electronic spark advance |
| Fuel System | Electronic Fuel Injection (EFI) |
| Alternator Amp | 15 amp / 186 watt |
| Cooling System | Water-cooled with thermostat |
| Starting | Electric (turn-key) Manual |
| Gearcase Ratio | 1.92:1 |
| Gear Shift | F-N-R |
| Steering | Remote Tiller |
| Trim System | Manual Power Trim |
| Exhaust System | Through prop |
| Shallow water trim range (degrees) | 16 |
| Recommended Oil | Mercury 4-Stroke Outboard Oil |
| Recommended Fuel | 87 octane/up to 10% ethanol |
| Remote fuel tank standard (gal / L) | 6.6 / 25 |
| Engine Protection Operator Warning System | Low oil pressure Overheat Over-rev Sensor failure |
| Shaft Length | 15 in (381mm) 20 in (508 mm) |
| Dry Weight * Lightest model available | 157lbs / 71kg |
| CARB Star Rating | 3 |
FourStroke 25 - 30 HP Engine Tests
FourStroke 25 - 30 HP Resources
You can order all available Mercury literature online or through any authorized Mercury dealer. Please have your outboard or sterndrive serial number before placing the order.
- Operation, Maintenance and Warranty Manuals
- Parts Manual
- Service Manual
Request printed brochures by mail or download as an electronic PDF.
Request a BrochureFourStroke 25 - 30 HP Boat Brands
