115 FourStroke
The Mercury 115 FourStroke is a naturally aspirated 2.1-litre inline-four petrol outboard, current since 2014, with a published dry weight of 163 kg for the lightest 20-inch model.
This is the current 2.1 L FourStroke 115, not the old two-stroke 115 and not the pre-2014 1.7 L FourStroke it replaced. Mercury announced the 75 / 90 / 115 platform in mid-2014 as a 2.1 L, four-cylinder, eight-valve SOHC family. Displacement is 2.1 L / 128 cid, bore and stroke 90 × 81 mm. It is still in the 2026 FourStroke 75–150 hp range.
Full-throttle range on the standard FourStroke is 5000–6000 rpm. The standard gearcase is 2.07:1; dry weight of the lightest model is 359 lb / 163 kg. An optional Command Thrust gearcase (2.38:1) is published at 363 lb / 165 kg. Shafts are 20 and 25 inches.
Horsepower is 115. Mercury's EMEA/AU tables print 115 / 84.6 kW; US dealer inventory prints 115 HP (86 kW). Those are two conversions of the same rating, so power_kw is omitted.
The Pro XS 115 is the same 2.1 L / 115 hp block with a higher WOT band of 5300–6300 rpm and is folded as a variant.
Specifications
Power
- Power
- 115 hp
- Rated speed
- 6000 rpm
Engine
- Configuration
- inline 4
- Cylinders
- 4
- Displacement
- 2.1 L
- Weight
- 163 kg
- Fuel
- Petrol
- Mounting
- Outboard
- Stroke
- 4-stroke
Reviews
No independent reviews on file yet.
Sources
- 1. FourStroke 75-150 hp — Mercury Marine
- 2. Mercury 115 HP EFI — 115 / 84 kW, 2.1 L, 5000-6000, 163 kg — Hi Tech Marine
- 3. Mercury Announces All New Outboard Line: 75-90-115 FourStrokes — Power Boating Magazine
Specifications compiled from manufacturer sources.