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 30 horsepower 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.

ENGINE   
Engine Type          3 (in-line)    
Horsepower          25 hp (18.6 kW) at prop    
Displacement          32.1 ci (526 cc)    
Bore x Stroke          2.40 x 2.36 in. (61 x 60 mm)    
RPM          5,000 - 6,000    
Fuel Induction          2-valves per cylinder, single overhead cam (SOHC), Electronic Fuel Injection (EFI)    
Ignition          CDI with electronic spark advance    
Starting          Electric (turn-key), manual    
Cooling          Water-cooled with thermostat    
Exhaust          Through prop    
DRIVETRAIN   
Gear Ratio          1.92:1    
Gear Shift          F-N-R    
ELECTRICAL   
Alternator          15A, 186W    
MEASUREMENTS   
Shaft Length          S: 15 in. (381 mm)
L: 20 in. (508 mm)    
Weight          157 lbs. (71 kg)    
OPERATIONAL   
Steering          Remote, tiller    
Trim System          Manual, power trim    
Instrumentation          Engine Protection Operator Warning System: Low oil pressure, overheat, over-rev, sensor failure