Mercury – Thermostat | Yamaha 4-Stroke Cooling System | Marine-Grade Construction | 8M6010297

Overview

Any boater who’s spent long days offshore knows there’s a certain comfort in hearing a big four-stroke come to life and settle into a smooth, confident idle. That steady heartbeat tells you everything is working the way it should. The Quicksilver 8M6010297 Thermostat helps keep Yamaha F250 outboards in that sweet spot—warming quickly, maintaining the right operating temperature, and delivering reliable power whether you’re running wide open or easing back into the marina after sunset. It’s a small part with a huge impact on peace of mind, especially when you rely on your engine to get you home.

Key Features

• Designed for 250hp Yamaha VF250 4-stroke outboards
• Built to meet all OEM temperature and performance specifications
• Maintains correct operating temperature for strong engine response
• Direct replacement for Yamaha 6CB-12411-10-00
• Thermostat only; hardware, gaskets, and seals sold separately
• Durable marine-grade design for long life in saltwater and freshwater

Engine & Boat Compatibility

• Fits Yamaha F250 and VF250 4-stroke outboards
• Common on offshore center consoles, bay boats, dual consoles, and pilothouse boats
• Works for vessels running in freshwater, inshore saltwater, or open ocean environments
• Compatible with Yamaha 4.2L platforms—always verify with your model and serial number

Performance & Practical Benefits

A thermostat is one of those parts you rarely think about—until it stops doing its job. With the Quicksilver 8M6010297, you’ll immediately feel the difference in how cleanly and confidently your Yamaha settles into its rhythm.

• Fast warm-up on cold mornings
• Stable temperature control for consistent fuel burn and timing
• Smoother throttle response, especially under heavy load
• Better efficiency from improved combustion conditions
• Reduced internal wear thanks to correct operating heat

When your engine holds the proper temperature, everything feels steadier and more predictable. And on a long run in choppy water, that reliability matters.

Why Buy OEM

There are plenty of aftermarket thermostats out there, but very few truly match the performance and accuracy of an OEM-spec component. With Quicksilver, you get:

• Perfect temperature range engineered for Yamaha’s 4.2L platform
• Proper fitment with no modification or guesswork
• Long-term durability in marine environments
• Better reliability than bargain alternatives
• Confidence that your cooling system is working exactly as intended

It’s the difference between hoping your engine runs right and knowing it will.

FAQ

Q1: Which Mercury engines does this thermostat fit?

This part is specifically for Yamaha VF250 outboards, not Mercury engines.

Q2: What sets this thermostat apart from aftermarket versions?

Its temperature precision and marine-grade construction match Yamaha OEM specifications for consistent cooling and long service life.

Q3: How can I verify fitment?

Match your Yamaha model and serial number with your service manual to ensure this thermostat is the correct replacement.

Q4: Can it be used in saltwater?

Absolutely. It’s designed for freshwater, inshore, and offshore use.

Q5: Is installation straightforward?

Most boat owners comfortable with basic maintenance can install it easily, though always follow factory torque specs and sealing procedures.