Mercury—Quicksilver 8M6007421 Engine Starter | Yamaha Outboard Series | 12-Volt | 8M6007421

Overview

Every boater knows that moment when you turn the key and listen for the engine to come alive. It’s a small thing, but it carries all the weight of the day—your plans, your crew, the water waiting just beyond the dock. A dependable starter isn’t glamorous, but when it works exactly the way it should, you feel it. There’s a kind of quiet confidence that settles in, the kind that tells you you’ll be on plane soon, heading toward open water without a second thought.

The Quicksilver 8M6007421 starter brings that feeling back—steady, reliable, and built to fire your Yamaha outboard to life every time.

Key Features

• Designed for select Yamaha 75 horsepower outboards, 2004 and newer
• Durable permanent-magnet gear-reduction construction
• Counter-clockwise rotation with a 13-tooth drive
• Built with high-temperature epoxy armatures for strength and insulation
• Copper bushings for long, dependable service life
• Meets Marine SAEJ1171 certification for safety

Engine & Boat Compatibility

• Fits select Yamaha 75 horsepower outboards, model years 2004 and newer
• Compatible with pontoons, center consoles, bay boats, aluminum fishing boats, and runabouts
• Ideal for both recreational and light-commercial marine use
• Supports Yamaha rigging used across freshwater and nearshore saltwater environments

Performance & Practical Benefits

A good starter doesn’t call attention to itself. It just works—cleanly, smoothly, and without hesitation. With this Quicksilver starter, that’s exactly what you get. Turn the key and you’ll feel a solid, confident engagement. No dragging, no inconsistency, no uncertainty.

The permanent-magnet design puts extra torque right where you need it, especially on early-morning starts when the air is cool and the engine is still waking up. The gear-reduction system adds a steady, secure crank that feels tight and controlled, not strained. And inside, the components are built to handle the realities of marine life—heat, vibration, and moisture.

From long weekends chasing fish to casual afternoon cruises, this starter brings a level of reliability that helps you focus less on the engine and more on the water in front of you.

Why Buy OEM

When it comes to starters, compatibility isn’t something you want to gamble with. This is a genuine Quicksilver component built to Mercury’s strict standards and engineered specifically to match Yamaha’s electrical and mechanical requirements. Aftermarket versions might claim to fit, but they often fall short when it comes to torque output, longevity, and corrosion resistance.

Buying OEM means you get the right fit the first time, backed by decades of engineering experience. It also means fewer surprises, less troubleshooting, and a longer service life. For most boaters, that’s worth far more than the small savings on lower-quality alternatives.

FAQ

Q1: Which engines does this part fit?

It fits select Yamaha 75 horsepower outboards from 2004 and newer.

Q2: How is this different from aftermarket starters?

It delivers OEM-level torque, durability, and corrosion protection designed specifically for Yamaha applications.

Q3: How can I confirm fitment?

Match your engine’s model year and check your owner’s manual, or compare the part number to your existing starter.

Q4: Can it be used in saltwater?

Yes. It’s built for both freshwater and saltwater boating with corrosion-resistant components.

Q5: Is installation straightforward?

Most boat owners with basic tools can install it, but a technician can handle it if you prefer a quick swap.