Mercury FourStroke 9.9 HP EFI Outboard Motor 2024

Mercury 9.9 HP EFI 2024: The Fuel-Injected 9.9 Standard

The 2024 Mercury 9.9 HP EFI FourStroke brings electronic fuel injection to America’s favorite horsepower class. The 208cc twin cranks instantly in any weather, responds crisply from idle to wide open, and never suffers gummed carburetors after storage. Mercury’s multi-function tiller — the world’s first — puts shift, throttle, and controls in one hand; F-N-R gearing simplifies docking; and manual or electric start suits any rig. Add no-spill oil changes and a maintenance-free valve train, and this is the modern benchmark of the 9.9HP outboard class.

Key Features (2024)

• EFI — instant all-weather starting
• 208cc twin — smooth and quiet
• Multi-function tiller; F-N-R gearing
• Manual or electric start; low-maintenance design

Specifications

• Engine: 2-cylinder four stroke, 208cc
• Horsepower: 9.9 HP
• Fuel Induction: EFI
• Starting: Manual or Electric
• Gearshift: Forward-Neutral-Reverse
• Steering: Tiller
• Fuel: External tank, 87 octane
• Shaft: 15″ (S) / 20″ (L)

Benefits & Applications

For 14–16 ft aluminum boats, kicker/trolling duty, tenders, and HP-restricted lakes. Rivals: Yamaha F9.9 2024, Suzuki DF9.9B 2024. More power: Mercury 15 HP EFI 2024.

Compare Model Years

See the 9.9 HP EFI 2025 and 9.9 HP EFI 2026, all Mercury Outboards, or the Mercury brand guide.

Frequently Asked Questions

Is the Mercury 9.9 fuel injected?

Yes — EFI is standard, delivering instant starts and crisp response.

What is the multi-function tiller?

Mercury’s signature tiller integrates throttle, shift, and controls in one adjustable handle, configurable for left- or right-hand use on select models.

Best uses?

Kicker/trolling duty, 14–16 ft aluminum boats, tenders, and restricted lakes.