Tohatsu MFS15 EFI Outboard Motor 2024 – 15HP Four Stroke

Tohatsu MFS15 EFI 2024: The Lightest Battery-Less EFI 15 in the Industry

The 2024 Tohatsu MFS15 EFI is built around a 333cc (20.3 cu in) two-cylinder four stroke — bore and stroke 61 x 57 mm — rated 15 HP (11.0 kW), and it holds a genuine industry distinction: the lightest four stroke battery-less EFI 15 HP model made. That matters because power-to-weight is the single most important factor in a small outboard. Tohatsu’s battery-less electronic fuel injection means a digital ECU meters fuel precisely with no choke and no battery required — a recoil starter is standard on all models — giving immediate starting in all conditions, quicker throttle response, smoother trolling, and up to 50% more distance on the same fuel at wide open throttle compared with the carbureted engine it replaced. A tool-free fuel/water separator with a floating indicator ring is standard equipment. A standout in the 15HP outboard class.

Key Features (2024)

• Battery-less EFI — no choke, no battery, recoil start on all models
• Lightest battery-less EFI 15HP four stroke in the industry
• Up to 50% farther on less fuel at WOT vs. the previous carbureted model
• Digital ECU — immediate starting, quicker response, smoother trolling
• Tool-free fuel/water separator; F-N-R shift lever; Power Tilt available

Specifications

• Engine: 2-cylinder four stroke, 333cc (20.3 cu in)
• Bore x Stroke: 61 x 57 mm (2.4 x 2.24 in)
• Horsepower: 15 HP (11.0 kW)
• Fuel Induction: Battery-less Electronic Fuel Injection (EFI)
• Starting: Manual (recoil) or Electric
• Gearshift: Forward-Neutral-Reverse
• Steering: Tiller or remote
• Fuel: Separate tank, 87 octane unleaded
• Shaft: 15″ (S) / 20″ (L)

Benefits & Applications

Fuel injection without the battery requirement is a rare combination — you get modern starting and economy while keeping the simplicity of a pull-start portable. Ideal for 14–16 ft aluminum boats, skiffs, inflatables, pontoons, and tenders. Rivals: Suzuki DF15A 2024, Honda BF15 2024, Mercury 15 HP EFI 2024. Same block, top tune: Tohatsu MFS20 EFI 2024.

Compare Model Years

See the MFS15 EFI 2025 and MFS15 EFI 2026, all Tohatsu Outboards, or the Tohatsu brand guide.

Frequently Asked Questions

What does battery-less EFI mean?

The fuel injection system runs without a battery — a recoil starter is standard on all models, so you get modern injection with pull-start simplicity.

Is there really no choke?

Correct. The digital ECU handles cold starts automatically, so there’s no choke to set or forget.

How much fuel does EFI save?

Tohatsu states up to 50% farther on less fuel at wide open throttle compared with the previous carbureted model.