EMP 75-00404 Thermostats & PartsThis product replaces:840080479620Normalized SKU: 7500404UPC Code: 840080479620

EMP 75-00403-BR Thermostats & Parts Your outboard's thermostat is doing quiet, thankless work every time the engine runs. It regulates coolant flow to keep the engine operating in its ideal temperature range, opening to allow flow once the engine reaches operating temperature and closing to retain heat during warm-up. When it fails, the engine either runs too cold and fouls plugs, or overheats and triggers alarms that ruin an otherwise perfectly good day on the water. The EMP 75-00403-BR is a brass thermostat rated at 147 degrees Fahrenheit, designed for select Mercury and Mariner V6 outboards in the 135 to 200 horsepower range, covering both EFI and carbureted 2-stroke configurations. The brass construction gives it an edge in corrosion resistance compared to standard thermostats, which matters in the saltwater and brackish environments where these engines often spend their time. It is a direct replacement for Sierra part number 18-3553, so if you are cross-referencing from that number, you are in the right place. Thermostat replacement is a straightforward job that is easy to include in a seasonal service or tune-up. If your engine has been running cooler than normal, taking longer to reach operating temperature, or throwing overheat warnings without an obvious cause, the thermostat is a logical and inexpensive first step in the diagnosis. Compatibility and specs at a glance: Fits select Mercury and Mariner V6 outboards, 135 to 200 horsepower Compatible with EFI and carbureted 2-stroke configurations Opens at 147 degrees Fahrenheit Brass construction for improved corrosion resistance Replaces Sierra 18-3553 Built to OEM specifications by EMP Normalized SKU: 7500403BRUPC Code: 840080411200

EMP 1399-39009 Thermostats & PartsThis product replaces:840080477442Normalized SKU: 139939009UPC Code: 840080477442

Sierra 18-36250 Thermostats & Parts The Sierra 18-36250 is a precision-engineered thermostat designed specifically for Suzuki outboard engines ranging from 100 to 300 horsepower, covering model years 2021 through 2024. This critical cooling system component regulates engine operating temperature, ensuring your engine runs at optimal temperature for maximum performance, fuel efficiency, and longevity. The thermostat controls coolant flow through your engine's cooling system by opening and closing in response to temperature changes. When the engine is cold, the thermostat remains closed, allowing the engine to warm up quickly to its optimal operating temperature. Once the engine reaches the proper temperature, the thermostat opens to allow coolant circulation, maintaining consistent engine temperature and preventing overheating. Manufactured to meet or exceed OEM specifications, this Sierra thermostat features quality construction designed to provide reliable, accurate temperature control throughout its service life. A properly functioning thermostat is essential for preventing engine damage from overheating, reducing excessive wear from running too cold, maintaining proper fuel mixture and combustion efficiency, and ensuring optimal engine performance across all operating conditions. A faulty thermostat can cause serious problems, including overheating, poor fuel economy, increased emissions, reduced power output, and accelerated engine wear. Common signs of thermostat failure include engine running too hot or too cold, temperature fluctuations, poor heater performance, and coolant leaks. Regular inspection and replacement of thermostats during routine maintenance helps prevent these issues and ensures your engine operates at peak efficiency. Designed specifically for Suzuki 100-300 HP engines from 2021-2024, this thermostat ensures proper fit and function for your specific engine model. Whether you're performing scheduled maintenance or replacing a failed thermostat, this Sierra component provides the quality and reliability needed to keep your engine running at optimal temperature. Compatibility: Suzuki outboard engines: 100-300 HP Model years: 2021-2024 Meets or exceeds OEM specifications Precision temperature control Essential for optimal engine performance Prevents overheating and excessive wear Interchange: Suzuki Outboard    17670-90J20Suzuki Outboard    17670-90J21 Normalized SKU: 1836250UPC Code: 808282391737

Sierra 18-36140 Thermostats & Parts The Sierra 18-36140 is a precision-engineered thermostat designed specifically for Mercury outboard engines ranging from 175 to 300 horsepower. This critical cooling system component regulates engine operating temperature, ensuring your engine runs at optimal temperature for maximum performance, fuel efficiency, and longevity. The thermostat controls coolant flow through your engine's cooling system by opening and closing in response to temperature changes. When the engine is cold, the thermostat remains closed, allowing the engine to warm up quickly to its optimal operating temperature. Once the engine reaches the proper temperature, the thermostat opens to allow coolant circulation, maintaining consistent engine temperature and preventing overheating. Manufactured to meet or exceed OEM specifications, this Sierra thermostat features quality construction designed to provide reliable, accurate temperature control throughout its service life. A properly functioning thermostat is essential for preventing engine damage from overheating, reducing excessive wear from running too cold, maintaining proper fuel mixture and combustion efficiency, and ensuring optimal engine performance across all operating conditions. A faulty thermostat can cause serious problems including overheating, poor fuel economy, increased emissions, reduced power output, and accelerated engine wear. Common signs of thermostat failure include engine running too hot or too cold, temperature fluctuations, poor heater performance, and coolant leaks. Regular inspection and replacement of thermostats during routine maintenance helps prevent these issues and ensures your engine operates at peak efficiency. Designed specifically for Mercury 175-300 HP engines, this thermostat ensures proper fit and function for your specific engine model. Whether you're performing scheduled maintenance or replacing a failed thermostat, this Sierra component provides the quality and reliability needed to keep your high-performance engine running at optimal temperature. Compatibility: Mercury outboard engines: 175-300 HP Meets or exceeds OEM specifications Precision temperature control Essential for optimal engine performance Prevents overheating and excessive wear Designed for high-performance engines Interchange: Mercury Marine    8M0137816Mercury Marine    8M0162139 Normalized SKU: 1836140UPC Code: 808282391744

Mercury Marine 8M0161442 Thermostats & PartsMercury Thermostat #8M0161442Normalized SKU: 8M0161442UPC Code: 678633117176

Recmar REC876080 Thermostats & PartsThis product replaces:824912, 82812, 841951, 858640, 875781, 875790, 876080, 876097, 876797Normalized SKU: REC876080

Recmar REC119773-49550 Thermostats & PartsThis product replaces:119773-49550Normalized SKU: REC11977349550

Mercury Marine 8M6013867 Thermostats & Parts OEM thermostat assembly for Mercury and Yamaha marine engines, maintaining precise coolant temperature regulation for optimal engine performance and longevity. Yamaha-based 4.2L 4-stroke outboards 225-300 HP Normalized SKU: 8M6013867UPC Code: 678633206511

Mercury Marine 8M6013865 Thermostats & Parts OEM-equivalent thermostat for Yamaha 4-stroke outboards ranging from 75 to 250 HP. Engineered to factory specifications, this Quicksilver component maintains precise coolant flow and engine temperature regulation across Yamaha F75, F90, F80, F100, VF200, VF225, and VF250 models (2001 and newer). Meets all original equipment manufacturer standards for reliable thermal management. Installation hardware, gaskets, and seals are sold separately—consult your owner's or service manual for application details and proper installation procedures. Normalized SKU: 8M6013865UPC Code: 678633206498

Mercury Marine 55131A5 Thermostats & PartsMercury Thermostat Housing Mercruiser #55131A5Normalized SKU: 55131A5UPC Code: 745061159716

Crusader R025027A Thermostats & Parts Thermostat Housing 8.1L FWC Replaces Crusader R025027 Normalized SKU: R025027A

Yamaha 6AW-12411-00-00 Thermostats & Parts Thermostat Normalized SKU: 6AW124110000

Crusader R025037 Thermostats & Parts Full Thermostat Housing 5.7L Engine Normalized SKU: R025037