FourStroke 2.5-20hp
Mercury FourStroke outboards are made to unlock the inaccessible. To make light work of long journeys. The 2.5 to 20hp FourStroke outboards empower you to enjoy the water on your terms and reach places you wouldn’t dare venture with other engines. They’re reliable, compact, lightweight, easy to install and simple to operate, while still delivering quick acceleration and impressive speed. The only thing missing is a destination.
Electronic Fuel Injection (EFI)
From the moment you crank the engine to the moment you drop the throttle, EFI technology (on 8 to 20hp outboards) responds with instant power. Surefire starting in all weather conditions. Smooth, efficient acceleration. Maximum fun.
Advanced Tiller
With a range of adjustments, easy-to-reach controls and the flexibility to be set up for left- or right-handed operation (on select models), Mercury tiller handles put you in complete command of your adventures.
Battery-Free EFI
Go farther confidently with battery-free EFI technology, included with manual-start 8 to 20hp outboards. It lets you enjoy the flexibility of portability, without needing to bring along a cranking battery.
Easy Portability
Simple to install and lightweight, 2.5 to 20hp FourStroke outboards let you bring along the fun wherever it’s needed.
Convenient Maintenance
We made maintenance easier with features like a no-spill oil change system, easy-out fuel filter and lifetime maintenance-free valve train.
Characteristics
| MODEL | FourStroke 2.5hp | FourStroke 3.5hp | FourStroke 4hp | FourStroke 5hp Sail Power | FourStroke 5hp | FourStroke 6hp | FourStroke 6hp EFI | FourStroke 8hp EFI | FourStroke 9.9hp EFI | FourStroke 15hp EFI | FourStroke 20 HP |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Horsepower | 2.5 | 3.5 | 4 | 5 | 5 | 6 | 6 | 8 | 9.9 | 15 | 20 |
| Alternator amp / Watt | N/A | N/A | N/A | 4 amp (50 watt) | N/A | N/A | N/A | 12 amp (145 watt) | 12 amp (145 watt) | 12 amp (145 watt)/ electric start model | 12 / 145 |
| Smartcraft compatible | No | No | No | No | No | No | No | No | No | No | - |
| Displacement (CID/CC) | 5.2 / 85 | 5.2 / 85 | 7.5 / 123 | 7.5 / 123 | 7.5 / 123 | 7.5 / 123 | - | 12.8 cu in (209cc) | 12.8 cu in (209cc) | 20.3 / 333 | 20.3 / 333 |
| Dry weight *Lightest model available | 41 lbs / 18 kg | 41 lbs / 18 kg | 57 lbs / 26 kg | 59 lbs / 27 kg | 57 lbs / 26 kg | 57 lbs / 26 kg | 87.9 lbs / 39.9 kg | 88 lbs / 40 kg | 85 lbs / 38.5 kg; 100 lbs/45.5 kg (CT Model) | 99 lbs / 45 kg | 99 lbs / 45 kg |
| Engine Type | 1 cylinder | 1 cylinder | 1 cylinder | 1 cylinder | 1 cylinder | 1 cylinder | 1 cylinder | Inline-2 | Inline-2 | Inline-2 | Inline-2 |
| HP / kW | 2.5/1.8 | 3.5/2.6 | 4/2.9 | 5/3.7 | 5/3.7 | 6/4.4 | 6/4.41 | 8/6.0 | 9.9/7.4 | 15/11.1 | 20 / 14.7 |
| Integrated fuel tank (gal / L) | 0.3Gal /1L | 0.3Gal /1L | 0.3Gal /1L | 0.3Gal /1L | 0.3Gal /1L | 0.3Gal /1L | N/A | N/A | N/A | - |
|
| Remote fuel tank standard (gal / L) | N/A | N/A | Optional | Optional | Optional | Optional | Optional | 3.2Gal /12L | 3.2Gal /12L | 3.2Gal /12L | 3.2 Gal / 12 L |
| Starting | Manual | Manual | Manual | Manual | Manual | Manual | Manual | Manual | Manual | Manual | Manual or electric |
| Trim System | Manual | Manual | Manual | Manual | Manual | Manual | Manual | Manual | Manual, Power tilt (CT model) | Manual, Power tilt | - |