Mercury – Thermostat | Yamaha F/VF Series Cooling System | Marine-Grade Brass & Stainless Components | 8M6010299

Overview

When you spend enough time on the water, you learn to trust the little things—especially the parts you never see but rely on every time you turn the key. The Quicksilver 8M6010299 Thermostat is one of those quiet protectors. It keeps your Yamaha 150–200hp 4-stroke running at the temperature it was engineered for, whether you’re drifting over calm flats at sunrise or hammering through afternoon chop to beat the weather home. It’s the kind of part that brings real peace of mind: steady heat control, consistent performance, and the confidence that your outboard’s heart is beating exactly as it should.

Key Features

• Designed for Yamaha F/VF150 through F/VF200 4-stroke outboards
• Built to match all OEM specifications for reliability and temperature accuracy
• High-quality marine-grade construction for long service life
• Thermostat only — installation hardware and seals sold separately
• Replaces Yamaha 6DA-12411-00-00 and 6DA-12411-01-00

Engine & Boat Compatibility

• Fits Yamaha 150hp–200hp 4-stroke outboards, including F150, F175, F200, VF150, and VF200
  • Common on a wide range of boats:Bay boats and flats skiffs
  • Center consoles
  • Pontoon boats
  • Multi-species fishing rigs
  • Runabouts and coastal cruisers
• Compatible with both fresh and saltwater environments

Performance & Practical Benefits

A good thermostat doesn’t just “open and close.” It quietly shapes the entire feel of your engine. With the Quicksilver 8M6010299 installed, you’ll notice:

• Smooth, predictable warm-up that prevents cold-running wear
• Stable operating temperature, even on long high-RPM runs
• A tight and responsive throttle feel thanks to consistent engine management
• Better fuel efficiency, since the engine isn’t fighting temperature swings
• Reduced risk of overheating, especially when running heavy or in warm backwaters

This is a part that protects your investment in real-world ways. Your outboard runs steadier. Your maintenance stays simple. And your engine lasts longer because it’s operating exactly where the engineers intended.

Why Buy OEM

When it comes to temperature control, precision matters. That’s why seasoned boaters stick with OEM-grade components like this one:

• Built to Mercury and Yamaha’s exact engineering standards
• Designed for long-term durability in harsh marine environments
• Reliable fitment — no shimming, grinding, or “making it work”
• Cost-effective protection for engines worth thousands
• Provides the same performance you'd expect from a factory-installed part

Think of it as cheap insurance for a very expensive outboard.

FAQ

Q1: Which engines does this thermostat fit?

It’s made for Yamaha 150–200hp F and VF series 4-stroke outboards. Always verify with your engine’s model and serial number.

Q2: What makes it better than aftermarket thermostats?

Quicksilver builds this thermostat to match OEM temperature ratings and response times, ensuring dependable heat control and long-term reliability.

Q3: How do I know it’s the correct replacement?

If your current part number matches 6DA-12411-00-00 or 6DA-12411-01-00, this is the correct thermostat.

Q4: Can I use it in both salt and fresh water?

Absolutely. It’s engineered for marine environments of all types.

Q5: Is installation easy?

Most boat owners comfortable with routine maintenance can replace a thermostat with basic tools. Just follow your service manual for torque values and gasket guidance.