Mercury 25hp EFI Tiller 4-Stroke Outboards

Mercury 25hp EFI Tiller 4-Stroke Outboards

Mercury Marine's advanced 4-stroke outboard engine delivers 40% better fuel efficiency than comparable 2-stroke models, making it one of the smartest long-term investments for anglers, recreational boaters, and commercial operators alike. These clean-running engines exceed California Air Resources Board (CARB) 3-Star emissions standards and produce 91% lower emissions than traditional 2-stroke outboards,  making them legal on sensitive waterways and California-regulated lakes where older engines are prohibited.

Engineered for reliability and ease on the water, this 4-stroke outboard combines ultra-quiet, smoke-free operation with smooth idling and consistent performance in all conditions. The battery-free EFI system delivers fast, dependable starts and instant throttle response without the added complexity of a battery-dependent setup. At just 99 lbs. dry weight, the lightweight design improves acceleration, top speed, and boat handling. A built-in decompression system and electronic CD ignition ensure easy cold starts, while one-stage over-rev protection and a low oil pressure warning system provide added confidence on every trip.

Available from 2.5 to 20 HP, the exclusive multifunction tiller handle, standard on 8 HP and higher models, puts shift, steering, throttle, throttle friction, and stop controls at your fingertips for complete one-hand control. Choose from manual-tilt, gas-assist, or power-trim configurations to match your boating style. The manual trim system with 5 to 6 trim positions plus a shallow-water drive adapts to everything from open water to shallow flats. All models ship ready to run with a propeller included.

Key Features

• Engine Type: 4-stroke
• Features: Quiet, smoke-free, environmentally friendly; 40% more fuel efficient than comparable 2-stroke engines; smooth running with exceptional idling; battery-free EFI for fast, dependable starts
• Exhaust: Thru-prop
• Dry Weight: 99 lbs.
• Steering Type: Tiller (2.5–6HP); tiller or remote (8HP and higher)
• Gearing: F-N-R, 2.15:1
• Trim Positions: 5–6 plus shallow-water drive
• Trim System: Manual, gas-assist, or power-trim options
• Tank Type: External
• Tank Capacity: 3 gallons
• Includes propeller
• U.S. shipment only