Exclusive EFI technology.

Mercury pioneered electronic-fuel injection technology for marine propulsion decades ago.

Turn-key starting. Instant action.

All mid-range Mercury FourStroke outboards feature turn-key starting for consistently quick and easy starts.

Quiet, smoke-free operation.

All Mercury FourStrokes feature a quiet combustion process made even quieter by sound-dampening cowls. Our technology is so clean, it actually exceeds CARB emissions standards for 2008.

Electronic fuel injection.

All Mercury FourStroke engines 25 hp and above are electronically fuel-injected for turn-key starts and smooth, efficient operation.

40 EFI

Specifications HP @ Prop: 40 kW @ Prop: 29.4 Max RPM (WOT): 5500-6000 Cylinder/Configuration: 3 (in-line) Displacement (CID/cc): 45.6/747 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 Steering: Remote or tiller Alternator Amp: 18 Alternator Watt: 223 Trim System: Gas assist 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.): 216 Dry Weight (kg.): 98 Operator Warning System: Overheat Available Propellers: Consult current dealer propeller guide SmartCraft: Yes CARB Star Rating: 3 Warranty: 3 years