YANMAR made the small diesel engine practical in 1933 and has refined it every decade since, for boats as well as machines.
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Powering Life on the Water and on the Jobsite
YANMAR delivers reliable power for marine and industrial applications, backed by advanced engineering, durable performance, and trusted support from Mastry Engine Center.
MARINE AND INDUSTRIAL
Explore YANMAR solutions for marine and industrial applications.
Since 1912
- 1912Founded in OsakaMagokichi Yamaoka starts the company
- 1933The small diesel, made practicalYANMAR’s HB is the world’s first practical small diesel
- 1947Into the waterYANMAR’s first marine engine, built for fishing boats
- 1971Built for pleasure boatsYANMAR’s first recreational marine engine
- 1994Cleaner at seaThe first marine diesel to earn IMO NOx certification
- 2024ElectricThe E‑Saildrive, YANMAR’s first electric drive
- TodayBacked by MastryThe #1 YANMAR recreational marine distributor in the U.S. by volume
YANMAR Marine
From daysailers to workboats
From compact sailboat auxiliaries to six-cylinder common-rail engines for yachts and workboats, YANMAR builds one family of marine diesels for the whole range. Mastry supplies the engines and genuine parts, and supports the dealers who install them, across the Americas.
YANMAR’s 5X Best in Class
- CleanVirtually odor- and smoke-free
- QuietLow vibration and noise
- PowerfulResponsive, with strong torque
- Fuel efficientDigitally controlled injection
- InterconnectiveWorks with modern helm displays
Start with your boat
Every YANMAR marine family is built around a kind of boat. Start with yours.
Sailboats
YM and JH series diesels: compact auxiliaries for sailboats and small craft, matched to YANMAR saildrives and marine gears.
Powerboats
The 4LV and 8LV families power sportboats, cruisers and tenders, with shaft, sterndrive and joystick options to match.
Performance and light commercial
The 6LY, 6LF and 6LT series bring six-cylinder common-rail power to larger yachts, patrol boats and workboats.
The lineup at a glance
Seven diesel families, from 14 HP sailboat auxiliaries to 640 HP six-cylinders for yachts and workboats.
Backed by Mastry
After the sale
Mastry trains and supplies YANMAR marine dealers across the Americas, keeps genuine YANMAR parts and fluids on the shelf, and runs its own service shop and rigging floor in Clearwater. Work can happen here, or at a dealer near you.
YANMAR E‑Saildrive
Electric power in the space your diesel already occupies
The YANMAR E-Saildrive is YANMAR’s first electric propulsion product: a 48 V drive with the motor, saildrive and cooling in one sealed unit, made for day sailors and cruisers up to 40 feet, depending on displacement.
YANMAR designed it as a drop-in replacement for the YANMAR YM diesel, one of the most popular sailboat engines. No hull modifications are needed.
It fits where your YM sits
If your sailboat has a YANMAR YM today, you already own the space an E-Saildrive goes into.
- 01Same footprintIt shares its footprint with the YANMAR YM diesel
- 02Eight boltsIt mounts on eight bolts, with no hull modification
- 03Inside the hullEvery electrical component sits inside the hull, on a 48 V plug-and-play system
- 04Ready to runPrefilled with oil, with integrated closed-loop oil cooling
What to expect under way
Electric range is counted in hours, and YANMAR publishes the hours. Every SDe model is S2‑60 rated: a full hour at full rated output, in 30°C sea water and 50°C air.
SDe711.6 kWh minimum battery
SDe1015.6 kWh minimum battery
SDe1523.2 kWh minimum battery
YANMAR’s estimated runtimes at each model’s minimum battery capacity. Actual performance varies.
That covers the work an auxiliary does on most sailboats: off the dock, through a calm, onto the mooring. The drive comes with its control system and harnesses; the battery bank and propeller are chosen for your boat and are not part of the standard delivery.
YANMAR Industrial
Compact diesels that do the heavy lifting
YANMAR builds its industrial diesels small for the power they make, so they fit equipment where space is tight. You’ll find them in construction, agricultural, generator and pump equipment, and Mastry supplies them across the Americas.
Built into every YANMAR industrial diesel
- CompactSmall footprint, easy to install
- Power-denseBig power from a small package
- QuietLow noise and vibration
- Emissions-readyBuilt to current EPA standards
The industrial lineup
Engines grouped into families by power band and use, alongside YANMAR’s portable diesel generators and trash pumps.
Backed by Mastry
Powered by YANMAR, supported from Clearwater
Mastry keeps YANMAR industrial engines in stock in Clearwater, matches replacements to worn-out units, new or remanufactured, and builds its own MasPower generators and pumps around YANMAR engines.
Close to home
A worldwide name, backed close to home
YANMAR’s marine network spans 130 countries and more than 2,100 locations. Across much of the Americas, it runs through Mastry.
60
+
Years in business
300
+
Certified dealers and service partners
130
Countries in YANMAR’s marine network
Why Choose YANMAR Through Mastry?
Choosing the right engine or power solution is about more than horsepower. Mastry helps customers navigate product options, application requirements, parts needs, service resources, and dealer support so they can make confident decisions. Whether your application is on the water or on the jobsite, Mastry connects you with YANMAR solutions built to perform.
Proven Engineering
YANMAR has a long history of diesel innovation and power system development across marine and industrial applications.
Application Expertise
Mastry helps match YANMAR products to real-world use cases, from repower projects to industrial equipment needs.
Quality You Can Rely On
One trusted source for YANMAR marine engines, industrial engines, generators, pumps, parts, and support.
Dealer and Service Support
Get connected with product resources, service guidance, and dealer support to keep your equipment moving.
FAQs
Have questions?
Have questions about YANMAR marine or industrial products? Explore answers about available product categories, applications, parts, service, and how Mastry can help you find the right solution.
What YANMAR products does Mastry offer?
YANMAR marine diesel engines for powerboats and sailboats, the YANMAR E-Saildrive electric drive, and YANMAR industrial engines, generators and pumps. Mastry distributes YANMAR across the Americas.
What YANMAR marine products are available?
YANMAR marine diesel engines for powerboats, sailboats, small craft and light-duty commercial use, plus the YANMAR E-Saildrive for sailboats. Mastry also supports customers with engine selection, repower resources, parts and dealer support.
What YANMAR industrial products are available?
Mastry’s YANMAR industrial lineup includes air-cooled engines, liquid-cooled engines, generators and pumps, used in equipment manufacturing, construction, agriculture and field operations.
Can I replace a YANMAR YM diesel with an electric drive?
Yes. YANMAR designed the E-Saildrive as a drop-in replacement for the YANMAR YM diesel, and no hull modifications are needed. See the E-Saildrive.
How long does a YANMAR E‑Saildrive run?
YANMAR’s estimates at the minimum battery capacity are 4 hours 45 minutes to 5 hours 15 minutes at cruise speed (30% power) and 1 hour 15 minutes to 1 hour 30 minutes at full power, depending on the model. Actual performance may vary.
Are the battery and propeller included with the E‑Saildrive?
No. The standard delivery is the drive, the control system and the harnesses. The battery and propeller are not included.
Does YANMAR support repower projects?
Yes. YANMAR marine engines are widely used for repowers, and Mastry has resources to help boat owners weigh their options. See YANMAR marine repower.
How do I get started?
Choose the product category that fits your application, YANMAR Marine or YANMAR Industrial, or use Mastry’s dealer resources to get help with product selection, parts or service.
Find the Right YANMAR Solution
From marine propulsion to industrial power, YANMAR products are built to deliver dependable performance where it matters most. Browse YANMAR marine and industrial products or connect with a Mastry dealer for help choosing the right solution.