Mercury Marine Mercury 9.9MH EFI

The Mercury 9.9 MH EFI FourStroke is a modern, lightweight, and versatile portable outboard designed for small fishing boats, aluminum hulls, and utility craft. Featuring Electronic Fuel Injection (EFI) for turn-key starting and superior fuel efficiency, this engine delivers smooth, quiet performance with Mercury’s proven long-term reliability.

The MH configuration features manual start, tiller steering, and a short shaft, making it the perfect fit for boats with standard 15" transoms. With its battery-free EFI system, this outboard offers effortless rope starting and consistent performance even in cold weather or after long periods of storage.

Built to the same high standards as Mercury’s larger engines, the 9.9 MH EFI uses premium corrosion‑resistant materials to ensure reliable performance in both freshwater and saltwater environments.

Key Features

9.9 HP Mercury EFI FourStroke engine

Battery-free Electronic Fuel Injection (EFI) for easy manual starting

Manual start with tiller handle control

Short shaft (MH) 15" configuration

Lightweight and portable design for its class

Quiet, fuel‑efficient operation

Durable, corrosion‑resistant construction

Ideal For

Small fishing boats and aluminum skiffs

Tenders and utility boats with standard transoms

Small pontoons or work boats

Reliable auxiliary or backup power

Specifications

Horsepower: 9.9 HP

Engine Type: Inline 2‑Cylinder FourStroke

Displacement: 208 cc

Starting System: Manual

Steering: Tiller

Shaft Length: 15" (Short Shaft)

Fuel Delivery: Electronic Fuel Injection (EFI)

Fuel Tank: External (Typically 12 L / 3.2 gal)

Full Throttle RPM Range: 5000–6000 RPM

Trim & Tilt: Manual (Ratchet style)

Weight: Approx. 84 lb (38 kg)