Mercury pioneered electronic-fuel injection technology
for marine propulsion decades ago.
Clean machines.
Every
Mercury FourStroke engine from 2.5 to 30 hp (except 15 hp)
has a CARB three-star ultra-low emissions rating.
A boating first.
The new 25/30 FourStroke is the boating industry’s first
battery-free manual-start EFI FourStroke. Combined with
standard decompression, it provides fast, easy starting
and smooth running.
Electronic fuel injection.
All Mercury FourStroke engines 25 hp and above are
electronically fuel-injected for turn-key starts and
smooth, efficient operation.
Quiet.
Tuned cowl induction reduces sound levels, making it one
of the quietest in its class.
Convenience.
Exclusive multifunction tiller handle features shift,
steering, throttle, throttle friction, and stop controls
for convenient one-hand operation. Available in
manual-tilt, gas-assist and power-trim.
25 EFI
Our completely redesigned 30 hp model is 47 pounds
lighter, while our 25 hp has been reduced by 18 pounds but
has increased torque. The reduced weight improves boat
balance, handling, and performance and makes it more
economical to operate overall.
Specifications HP @ Prop: 25 kW @ Prop: 18.4 Max RPM (WOT): 5000-6000 Cylinder/Configuration: 3 (in-line) Displacement (CID/cc): 32.1/526 Bore & Stroke (in): 2.56 x 2.95 Bore & Stroke (mm): 65 x 75 Cooling System: Water-cooled w/thermostat Ignition System: ECM 555 Digital Inductive Starting: Manual or Electric Gear Ratio: 2.00:1 Gear Shift: F-N-R (front mounted on tiller handle
models) Steering: Tiller or remote Alternator Amp: 18 Alternator Watt: 223 Trim System: Manual or power trim Exhaust System: Through prop Lubrication System: Wet sump w/ pressurized lube
system Recommended Oil: Mercury 4-Stroke Outboard Oil Fuel Induction System: 2-valve single overhead
cam Shaft Length (inches): 15/20 Shaft Length (mm): 381/508 Dry Weight (lbs.): 157 Dry Weight (kg.): 71 Operator Warning System: Overheat Available Propellers: Consult current dealer
propeller guide SmartCraft: Yes CARB Star Rating: 3 Warranty: 3 years
Mercury pioneered electronic-fuel injection technology
for marine propulsion decades ago.
Every
Mercury FourStroke engine from 2.5 to 30 hp (except 15 hp)
has a CARB three-star ultra-low emissions rating. 
The new 25/30 FourStroke is the boating industry’s first
battery-free manual-start EFI FourStroke. Combined with
standard decompression, it provides fast, easy starting
and smooth running.
Tuned cowl induction reduces sound levels, making it one
of the quietest in its class.
Exclusive multifunction tiller handle features shift,
steering, throttle, throttle friction, and stop controls
for convenient one-hand operation. Available in
manual-tilt, gas-assist and power-trim.
