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| ENGINE | E15DMH |
| Engine Type | L2 |
| Displacement [cm3] | 246 |
| Bore * Stroke [mm] | 56.0 x 50.0 |
| Max. prop Shaft output [kW (ps)] @r/min | 11.0 (15) @5000 |
| Fuel Induction System | Carburetor |
| Lubrication System | Pre-mixed Fuel and Oil |
| Engine Transom Height[mm (inch)] | S: 441 (17.4), L: 568 (22.4), X: 710 (30.3) |
| Dry Weight [kg] * | 38-41 |
| Starting System | Manual Starter |
| Controls | Tiller Handle |
| Tilt System | Manual Tilt |
Excellent choice! The YAMARINE E15DMH is a fantastic outboard motor with a great reputation. Let's break down everything you need to know about this popular 15hp four-stroke model.
Model: E15DMH (Often followed by a letter for the year, e.g., E15DMHL for a specific model year).
Engine Type: Air-cooled, 4-stroke, SOHC, single cylinder.
Displacement: 232cc
Power: 15 horsepower at 5500-6000 RPM.
Starting: Manual Pull Start (The "M" in DMH stands for Manual).
Shaft Length: 15 inches ("S" = Short) or 20 inches ("L" = Long). The "H" in DMH typically indicates a 20" shaft.
Weight: Approximately 41 kg (90 lbs) for the 20" shaft model. This is relatively light for a 4-stroke, a key advantage.
Gear Ratio: 2.08:1
Alternator: 6 amps @ 5000 RPM (standard for charging a battery and running basic electronics).
Ultra-Lightweight for a 4-Stroke: This is its biggest selling point. At around 90 lbs, it's much easier to carry, mount, and maneuver than many competitors. This makes it ideal for smaller boats, portability, and solo operation.
Air-Cooled Simplicity: Unlike most modern 4-strokes which are water-cooled, the E15DMH uses a fan-forced air-cooling system. This means:
No Water Pump, Impeller, or Tell-Tale: Fewer parts to maintain or fail. No risk of overheating from a clogged water intake.
No Winterization Worries: You don't need to worry about draining cooling passages for freezing temperatures.
Slightly Louder: It can be a bit noisier than a water-cooled engine due to the cooling fan.
Proven Reliability: Yamaha is renowned for durability, and this simple, single-cylinder engine is famously rugged and dependable. It's a "workhorse" motor.
Great Fuel Economy: As a 4-stroke, it sips fuel compared to an equivalent 2-stroke and doesn't require oil mixing.
Easy Maintenance: The simplicity of the air-cooled design makes owner maintenance straightforward.
Small Jon Boats and Skiffs (12-16 feet)
Fishing Boats and Dinghies
Sailboats as a auxiliary power (the 20" long shaft model is perfect for this)
Rental Fleets due to its durability and low maintenance.
Manual Start Only: No electric start option on this model. If that's a requirement, you'd need to look at the Yamaha F15 or F20 series.
Air-Cooling Limitations:
It's not designed for prolonged trolling or extremely low-speed operation for hours on end, as air cooling is less efficient at low RPMs. For casual trolling, it's generally fine.
It should not be run out of water (even for a few seconds) as there is no water pump to lubricate the impeller.
Vibration: Being a large single-cylinder engine, it has more vibration than a twin-cylinder motor, especially at idle. This is normal for its design.
Availability: The E15DMH has been in production for many years but has been largely succeeded by the F15 model line in many markets. You will likely be looking at used or new old stockmodels.
Oil Changes: Use quality SAE 10W-30 marine 4-stroke oil. Check and change it regularly per the manual (typically every 100 hours or annually).
Oil Filter: Change the spin-on oil filter with every oil change.
Gear Oil: Check and change the lower unit gear oil annually.
Air Filter: Keep the air filter clean. This is crucial for an air-cooled engine.
Fuel: Use fresh, ethanol-free gasoline if possible, or add a fuel stabilizer. Use the fuel/water separator filter.
Anode: Check and replace the sacrificial anode if needed.
| ENGINE | E15DMH |
| Engine Type | L2 |
| Displacement [cm3] | 246 |
| Bore * Stroke [mm] | 56.0 x 50.0 |
| Max. prop Shaft output [kW (ps)] @r/min | 11.0 (15) @5000 |
| Fuel Induction System | Carburetor |
| Lubrication System | Pre-mixed Fuel and Oil |
| Engine Transom Height[mm (inch)] | S: 441 (17.4), L: 568 (22.4), X: 710 (30.3) |
| Dry Weight [kg] * | 38-41 |
| Starting System | Manual Starter |
| Controls | Tiller Handle |
| Tilt System | Manual Tilt |
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