Tohatsu 18HP M18E2 Outboard Engine

The Tohatsu M18E2 is a compact 18HP two-stroke outboard designed for small boats, fishing boats, tenders, aluminium boats and other applications where useful power and manageable engine weight matter. The M18E2 uses a 294cc two-cylinder engine, produces 18HP (13.2kW), and has a 5,200–5,800 RPM maximum operating range. Tohatsu specifies a premixed gasoline-and-two-stroke-oil lubrication system, water cooling with a thermostat, through-hub exhaust and forward-neutral-reverse shifting.

This listing is based on the M18E2 specification family, with the original product information identifying the M18E2S short-shaft configuration. The short-shaft version uses a 15-inch transom height and weighs approximately 41kg with the propeller. Tohatsu also produced long-shaft and different starting/control configurations, so confirm the exact model suffix, shaft length and rigging requirements before purchase.

Tohatsu 18HP Performance and Design

The 294cc inline two-cylinder layout gives the M18E2 more displacement than many smaller portable outboards while keeping the engine relatively light. Its 18HP output is rated at the propeller shaft, and the factory operating range is 5,200–5,800 RPM. This makes correct propeller selection and matching the engine to the boat’s transom height important when setting up the motor.

The M18E2 uses a conventional two-stroke premix fuel system rather than a separate oil-injection system. Tohatsu specifies unleaded gasoline and TC-W3-rated two-stroke oil, with a 50:1 gasoline-to-oil mixture for the applicable manual-start configuration. Always follow the instructions supplied with the exact engine and verify the required mixture before operation.

Key Tohatsu M18E2 Specifications

Engine	Tohatsu M18E2
Power	18HP / 13.2kW
Engine type	Two-stroke, two-cylinder
Displacement	294cc / 17.94 cu in
Bore x stroke	60 x 52mm
Maximum operating range	5,200–5,800 RPM
Ignition	Flywheel magneto CD ignition
Cooling	Water cooling with thermostat
Lubrication	Premixed gasoline and two-stroke oil
Fuel	Unleaded gasoline, 87 octane minimum in the current Tohatsu specification
Fuel/oil mixture	50:1 for the applicable M18E2 premix specification
Gear shift	Forward, Neutral, Reverse
Gear ratio	1.85:1
Transom options	15-inch short shaft and 20-inch long shaft; other configurations may vary
Weight	Approximately 41kg / 90lb for the short-shaft manual configuration
Fuel tank	25L separate fuel tank specification
Propeller range	6 to 11.5 inches, depending on application and configuration

Why Choose a Tohatsu 18HP Two-Stroke?

The M18E2 is suited to owners who need more than a small 6–10HP portable outboard but still want a relatively compact two-cylinder engine. At approximately 41kg in the short-shaft manual configuration, it can be practical for boats where transom weight is an important consideration. The two-stroke design also keeps the engine mechanically straightforward compared with many modern four-stroke alternatives.

For fishing and general small-boat use, the combination of 18HP, 294cc displacement and a 5,200–5,800 RPM operating range gives the engine useful mid-range and top-end capability when correctly matched to the hull, load and propeller. The factory specification also includes shallow-water drive, through-prop exhaust and start-in-gear protection.

Transom and Rigging Considerations

Before buying or installing a Tohatsu 18HP, measure the boat’s transom and determine whether a 15-inch short shaft or 20-inch long shaft is required. An incorrect shaft length can place the propeller at the wrong depth and affect handling, cooling-water supply and performance.

The M18E2 family was offered in manual-start tiller, electric-start and remote-control configurations. The exact model suffix identifies the starting, steering/control and shaft arrangement. Check the identification plate and supplied equipment if you are purchasing a used engine, particularly when the listing does not specify the complete suffix.

Fuel, Oil and Maintenance

The M18E2 is a premix two-stroke, so fuel preparation is an important part of ownership. Use the correct unleaded gasoline and a suitable TC-W3 two-stroke marine oil, and maintain the specified fuel-to-oil ratio. Tohatsu’s documentation also specifies a thermostat-controlled water-cooling system and through-hub exhaust.

Regular inspection should include the cooling-water system, propeller, gearcase lubricant, spark plugs, fuel system and fasteners. If the engine is used in salt water, flushing and corrosion protection are particularly important. Follow the maintenance schedule for the exact model year and configuration rather than relying on a generic service interval.

Who Is the Tohatsu 18HP Outboard For?

• Small aluminium and fishing boats that require around 18HP of propulsion.
• Tenders and utility boats where moderate engine weight is important.
• Owners looking for a compact two-cylinder two-stroke outboard.
• Repower projects where a 15-inch or 20-inch transom configuration is appropriate.
• Boaters who prefer the mechanical simplicity of a conventional premix two-stroke.

Compare With Other Outboards at Performance Engines

If you are comparing compact outboards, the Mercury 8MH provides a smaller portable option, while the Suzuki 9.9HP 4-Stroke EFI offers a fuel-injected four-stroke alternative. For another lightweight small-engine option, see the Suzuki 6HP 4-Stroke. Buyers looking for more four-stroke power can also compare the Suzuki F20 4-Stroke Outboard Motor.

Frequently Asked Questions

How much horsepower does the Tohatsu M18E2 produce?

The Tohatsu M18E2 produces 18HP, equivalent to 13.2kW. Tohatsu lists the maximum operating range at 5,200–5,800 RPM.

What is the displacement of the Tohatsu 18HP?

The M18E2 has 294cc (17.94 cubic inches) of piston displacement, with two cylinders and a 60 x 52mm bore and stroke.

Is the Tohatsu M18E2 a two-stroke or four-stroke?

The M18E2 is a two-stroke outboard with two cylinders. Its lubrication system uses premixed gasoline and two-stroke oil.

What shaft lengths are available for the Tohatsu M18E2?

Tohatsu lists 15-inch short-shaft and 20-inch long-shaft M18E2 configurations. The exact shaft length should be matched to the boat’s transom height.

How much does a Tohatsu 18HP M18E2 weigh?

The short-shaft manual configuration is approximately 41kg (90lb) including the propeller. Long-shaft and electric-start configurations can weigh more.

What fuel does the Tohatsu M18E2 use?

The M18E2 uses unleaded gasoline. Tohatsu’s current specification lists 87-octane minimum fuel, while the applicable manual specifies the required fuel and oil mixture for the engine configuration.

What is the gear ratio on the Tohatsu 18HP?

The M18E2 uses a 1.85:1 gear reduction ratio. It has Forward-Neutral-Reverse gearing.

Does the Tohatsu M18E2 have electric start?

The M18E2 family was available in different configurations, including manual and electric-start versions. The exact model suffix should be checked before assuming the starting system supplied with a particular engine.

What boats are suitable for a Tohatsu 18HP?

The 18HP M18E2 can suit appropriately rated small fishing boats, aluminium boats, tenders and utility craft. Boat length, hull design, maximum rated horsepower, transom height and loaded weight should all be checked before installation.

Is the Tohatsu M18E2 suitable for saltwater use?

The engine can be used in marine environments, but saltwater operation requires proper flushing, inspection and corrosion protection. Follow Tohatsu’s maintenance guidance for the specific engine and operating conditions.

Buy a Tohatsu 18HP Outboard

The Tohatsu 18HP M18E2 combines 18HP output with a 294cc two-cylinder two-stroke design and relatively low weight for its power class. If this engine matches your boat’s transom, horsepower rating and intended use, contact Performance Engines for current availability, condition and configuration details before purchase.

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