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Mercury FourStrokes have long led the pack in clean, quiet, fuel-efficient outboard power, and now the gap has grown even wider. We combined innovative engineering with advanced reliability 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 models have an industry-first batteryless EFI system for easier starting, smooth running and improved efficiency.

The Flyway 25 EFI, with its popular Advantage MAX-4 HD graphics, special low-gloss paint and best-in-class noise reduction, is one of the stealthiest outboards on the market.

Flyway 25 EFI
The Flyway 25 EFI takes stealth one step further. The 25 EFI FourStroke is already the quietest in its class. Now its nearly invisible.
Advantage MAX-4 HD camouflage and special matching low-gloss paint
Best-in-class noise reduction
Industry leading battery-free EFI with a manual recoil (even on electric models) and automatic decompression
Convenient gas-assist or power trim are available
Exclusive shift-in-handle (tiller models)
Mercury FourStroke EFI outboards deliver consistent, easy starts, smooth operation and reliability. The 25 and 30 hp models are the industry's first batteryless EFI outboards.

All portable and mid-range Mercury FourStrokes feature INLINE DESIGNS for inherently smooth operation.

All Mercury FourStrokes are designed to run clean, helping to protect the environment for generations to come. Every Mercury mid-range FourStroke engine carries a CARB THREE-STAR ULTRA-LOW EMISSIONS RATING.

PRECISION ENGINEERED SHIFT SYSTEM delivers smooth shifting for an improved driving experience.

Every Mercury outboard comes with a THREE-YEAR LIMITED FACTORY-BACKED, NONDECLINING WARRANTY (except Mercury Racing models).



Parts Manual

Service Manual

Owners Manual

What year is my engine?

    Alternator: 15-amp/186-watt
Manufacturer: MERCURY Cooling: Water-cooled w/thermostat
Make: F25 Ignition: CDI w/electric spark advance
Year: Starting: Manual or electric with manual backup
Engine Type: 25 HP FLYWAY Exhaust: Through prop
Horsepower: 25 Trim: Manual, gas assist or power trim
Displacement: 32.1/526(in/cc) Fuel Induction: 2-valve single overhead cam
Bore/Stroke: 2.40x2.36/61x60(in/mm) Lubrication: Wet sump
Cylinders: 3 (in-line) Steering Remote or tiller
RPM: 5000-6000    
Weight: 157/71(lbs/kg) PRICING These prices are the "Manufacturer Suggested Retail Prices" (MSRP). These are just for comparison.
Gear Ratio: 1.92:1 US: dollars
Shaft lenght: 15 or 20/381 or 508(in/mm) UK: pounds
Gears: F N R Netherlands: euros
    France: euros
    Australia: dollars

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