125 HP

The most experience for the greatest value.

No direct injection engine has more experience, testing, or success under its belt than Mercury OptiMax. It’s not surprising that OptiMax repeatedly leads every direct injection category – including power, fuel efficiency, reliability, and versatility. It all adds up to a complete line of power that delivers more, and delivers it better. OptiMax remains the best value on the water and a top choice of boaters

 

Fuel Effeciency

Ultimate Efficiency

The innovative OptiMax DI system delivers the ultimate in efficiency, squeezing more miles and performance from every drop of fuel. The exclusive deflector-shaped pistons and combustion chambers enhance fuel economy and lower emissions by efficiently directing the fuel/air charge to the spark plug. The OptiMax Air Compressor provides a steady charge of cooled air for maximum combustion efficiency.

 

Reliability

Superior Durability

OptiMax’s durable gearcase features a heavy-duty prop shaft and Mercury-patented dual water pickups on the front end of the torpedo for a constant flow of cooling water. It is specifically designed to give you impeccable handling and incredible top speeds. Dome-Shaped Piston Heads direct the fuel-and-air charge to the spark plug more efficiently, providing outstanding durability along with excellent running quality.

Long-Lasting Stainless

OptiMax is built with more stainless steel and corrosion-resistant components, which translates to saltwater durability, longer intervals between maintenance, and lower cost of ownership. In addition, our lower-pressure direct-injection system also provides superior component durability and longevity.

 

Performance

Powerful And Smooth

The OptiMax Two-Stage Direct Injection System provides a constant supply of atomized fuel and air while the Vapor Separator Tank (VST) ensures a constant supply of liquid fuel for the injection process. The result is unmatched throttle response, instant starting, and smooth performance.

Light And Fast

The inline 3-cylinder design is slim and lightweight making it a great choice for almost any type of boat. It consistently outperforms other DI engines in holeshot, mid-range acceleration and top-end speed.

Leading Gearcase Technology

No other marine engine company has more knowledge about hydrodynamics and gearcase design than Mercury. We have the right gearcase configuration and technology to match any boating application. Our designs result in less drag – giving you better handling and performance.

A Prop For Every Purpose

No one offers a wider variety of propellers than Mercury Marine. From our four-blade, stainless steel Trophy Plus to the revolutionary Enertia, Mercury makes a prop that will maximize your boating enjoyment. Visit the Mercury Prop Selector to choose the prop that’s right for you.

HP/Kw @ Prop 125 / 93.2
Full throttle RPM 5000-5750
Cylinder Configuration 3 (in-line)
Displacement (CID / CC) 93 / 1526
Bore and Stroke (in / mm) 3.63 x 3.00in
92 x 76mm
Ignition PCM Digital Inductive
Fuel System 2-stage Direct Fuel Injection (DFI)
Alternator Amp 60 amp / 756 watt
Cooling System Water-cooled with thermostat & pressure-controlled
Starting Electric (turn-key)
Gearcase Ratio 2.07:1
Gear Shift F-N-R
Steering Big Tiller Compatible
Remote
Trim System Power Trim
Exhaust System Though prop
Shallow water trim range (degrees) 20
Recommended Oil Mercury OptiMax/DFI Outboard Oil
Recommended Fuel 87 octane/up to 10% ethanol
Remote fuel tank optional Yes
Engine Protection Operator Warning System Low oil level
Overheat
Over-rev
SmartCraft Engine Guardian
Compatible with Smartcraft Digital Technology Yes
Shaft Length 20 in (508 mm)
25 in (635mm)
Dry Weight * Lightest model available 375lbs / 170kg

Engine Test

Test Date Title Type Engine HP Range Last Updated
05/2007 115 hp OptiMax – Bentley 240 Cruise OptiMax OptiMax 1.5L 11/30/2007
06/2009 115 hp OptiMax – Crestliner 1750 Sport Angler OptiMax OptiMax 1.5L 06/30/2009
03/2008 115 hp OptiMax – DuraCraft 1860 OptiMax OptiMax 1.5L 05/06/2008
03/2008 115 hp OptiMax – DuraCraft 2074 Bay OptiMax OptiMax 1.5L 05/05/2008
09/2006 115 hp OptiMax – Lund 1700 Pro Sport OptiMax OptiMax 1.5L 11/30/2007
05/2010 115 hp OptiMax – Lund 1775 Impact Sport OptiMax OptiMax 1.5L 09/20/2010
05/2006 115 hp OptiMax – MirroCraft 1845 OptiMax OptiMax 1.5L 11/30/2007
08/2012 115 hp OptiMax – SmokerCraft Pro Angler XL 17 – SpitFire OptiMax OptiMax 1.5L 10/09/2012
01/2009 115 hp OptiMax – Vectra 1940 OptiMax OptiMax 1.5L 02/25/2009
06/2012 115 OptiMax – Mako 18 LTS Inshore – Trophy Plus OptiMax OptiMax 1.5L 07/17/2012
07/2010 125 hp OptiMax – Alumacraft Navigator 175 Sport OptiMax OptiMax 1.5L 09/14/2010
06/2012 125 hp OptiMax – Crestliner 1750 Fish Hawk – SpitFire OptiMax OptiMax 1.5L 09/12/2012
05/2010 125 hp OptiMax – Crestliner 1750 Fish Hawk DC OptiMax OptiMax 1.5L 12/10/2010
07/2010 125 hp OptiMax – Lund 1750 Tyee OptiMax OptiMax 1.5L 09/17/2010
09/2011 125 hp OptiMax – Triumph 195 Classic CC – Black Max OptiMax OptiMax 1.5L 05/07/2012
07/2010 75 hp OptiMax – Alumacraft Navigator 165 Tiller OptiMax OptiMax 1.5L 09/15/2010
05/2011 75 hp OptiMax – Lowe RX 2070 OptiMax OptiMax 1.5L 08/30/2011
06/2012 75 hp OptiMax – Lowe Stinger 175 Camo – SpitFire OptiMax OptiMax 1.5L 09/12/2012
09/2005 75 hp OptiMax – Lund 1800 Alaskan SS OptiMax OptiMax 1.5L 12/03/2007
07/2010 90 hp OptiMax – Alumacraft Navigator 165 CS OptiMax OptiMax 1.5L 09/14/2010
05/2007 90 hp OptiMax – Bentley 220 Cruise – Black Max OptiMax OptiMax 1.5L 09/13/2010
05/2007 90 hp OptiMax – Bentley 220 Cruise – Vengeance OptiMax OptiMax 1.5L 09/13/2010
07/2010 90 hp OptiMax – Crestliner 1700 Super Hawk OptiMax OptiMax 1.5L 09/17/2010
03/2008 90 hp OptiMax – DuraCraft 1860 Oyster Bay OptiMax OptiMax 1.5L 05/05/2008
03/2008 90 hp OptiMax – DuraCraft 1860 Sportfish OptiMax OptiMax 1.5L 05/05/2008
03/2008 90 hp OptiMax – Glassmaster 180 CC OptiMax OptiMax 1.5L 09/13/2010
03/2008 90 hp OptiMax – Glassmaster 180 DC OptiMax OptiMax 1.5L 05/05/2008
03/2011 90 hp OptiMax – Lowe 17′ Stinger HP – Black Max OptiMax OptiMax 1.5L 08/30/2011
03/2011 90 hp OptiMax – Lowe 17′ Stinger HP – Laser II OptiMax OptiMax 1.5L 08/30/2011
05/2011 90 hp OptiMax – Lowe 18 Sportsman OptiMax OptiMax 1.5L 08/30/2011
07/2011 90 hp OptiMax – Lowe RX 1756 SC OptiMax OptiMax 1.5L 08/30/2011
07/2011 90 hp OptiMax – Lowe RX 1860 SC OptiMax OptiMax 1.5L 08/30/2011
06/2008 90 hp OptiMax – Princecraft Pro 169 LX WS OptiMax OptiMax 1.5L 08/14/2008