Mercury – Starter Motor | EFI FourStroke Series | Marine-Grade Assembly | 879345T77

Overview

Every boater knows that moment right before you start the engine—the slight pause, the quiet hope, and the familiar twist of the key. When your starter motor is dependable, that moment turns into a smooth, confident roar that sets the tone for your entire day on the water. The Mercury 879345T77 Starter Motor is built for exactly that feeling. It’s the same starter your outboard was born with, designed to crank instantly, even after long stretches between trips or in the damp, unforgiving conditions that come with life on the water.

Key Features

• Replacement starter motor built for Mercury 75–115hp EFI FourStroke outboards
• Marine-grade construction designed specifically for outboard engine environments
• Reliable engagement and consistent cranking performance
• Built with components engineered for durability in heat, vibration, and corrosion
• Fits original mounting points for straightforward installation
• The exact starter assembly originally installed on your outboard

Engine & Boat Compatibility

• Fits Mercury 75–115hp EFI FourStroke outboards
• Compatible with engines in the 1B366823–2B094995 serial number range
• Ideal for center consoles, aluminum fishing boats, pontoons, bay boats, and multi-purpose runabouts
• Works with outboards used in freshwater, brackish water, and open coastal environments

Performance & Practical Benefits

A good starter isn’t just a part—it’s peace of mind. With the 879345T77, you’ll feel the difference the moment you turn the key. The motor engages smoothly without the hesitation you might get from worn or aftermarket components. It spins strong and steady, giving your EFI FourStroke the reliable start it needs whether the engine is cold at sunrise or warm after a long afternoon of drift fishing.

This starter is built with marine-specific engineering, meaning it’s prepared for moisture, vibration, and repeated hard use. The internal components are tightly sealed to keep out the salt, spray, and grime that quickly destroy automotive-style starters. The mounting and wiring points line up cleanly, so installation feels tight and secure, and you can trust the fitment without modification.

With this OEM assembly in place, you’ll notice fewer slow cranks, less strain on your electrical system, and a smooth, confident start each time you fire up. It’s the kind of upgrade that quietly improves every trip, even if nobody sees the part itself.

Why Buy OEM

Talk to anyone who runs Mercury Marine engines, and they’ll tell you—OEM matters.

• Mercury parts are engineered specifically for the loads, torque, and environment of outboard engines
• Better sealing and corrosion resistance than generic alternatives
• Designed to fit perfectly, preventing alignment issues that shorten starter life
• Lasts longer and performs more consistently than cheaper aftermarket options
• Saves money in the long run by reducing failures and unnecessary troubleshooting

Choosing OEM isn’t about brand loyalty—it’s about keeping your outboard dependable on every launch, every tide change, and every mile home.

FAQ

Q1: Which engines does the 879345T77 Starter Motor fit?

It’s built for Mercury 75–115hp EFI FourStroke outboards within the listed serial range.

Q2: What makes it different from aftermarket starters?

It’s marine-engineered with better sealing, stronger components, and the correct torque and engagement profile for Mercury EFI systems.

Q3: How can I confirm it’s the right replacement?

Match your engine’s serial number and horsepower range with Mercury’s specifications or your owner’s manual.

Q4: Can it be used in both salt and fresh water?

Absolutely—its corrosion-resistant design is built for any marine environment.

Q5: Is installation simple?

Most boat owners find it straightforward since it bolts directly into the factory mounting points.