O Ring
Amazon OnlyAlso fits 71 other vehicles
- 2002 polaris sportsman-700-a02ch68aa-ab-ac-ca-cb — Cylinder Cylinder Head
- 2003 polaris sportsman-600-a03ch59aa — Cylinder And Cylinder Head A03ch59aa Af Ag
- 2003 polaris sportsman-600-a03ch59aa — Cylinder Cylinder Head Af Ag
- 2003 polaris sportsman-700-a03ch68aa-ac-af-ah-al — Cylinder Cylinder Head
- 2004 polaris sportsman-600-a04ch59af-ah-aj-at-av — Cylinder Cylinder Head
- 2004 polaris sportsman-600-a04ch59ak-al-an-aq-aw — Cylinder Cylinder Head
- 2004 polaris sportsman-700-a04ch68ac-af-ah-aj-at-av — Cylinder Cylinder Head
- 2004 polaris sportsman-700-a04ch68ak-al-an-ao — Cylinder Cylinder Head
- 2004 polaris sportsman-700-a04ch68ap-aq-au-cu — Manifold Thermostat
- 2005 polaris sportsman-600-a05mh59ak — Cylinder And Cylinder Head A05mh59ak An
- 2005 polaris sportsman-600-a05mh59ak — Cylinder Cylinder Head An
- 2005 polaris sportsman-700-a05mh68ak-an-ad — Engine Cylinder Cylinder Head
- 2005 polaris sportsman-700-efi-a05mh68ac — Manifold And Thermostat A05mh68ac As At Au Aw
- 2005 polaris sportsman-700-efi-a05mh68ac — Manifold Thermostat As At Au Aw
- 2005 polaris sportsman-800-efi-a05mh76ac-au-aw — Manifold Thermostat A05mh76ac At Au Aw
- View all 71 →
The **Polaris Thermostat and O-Ring Replacement Set (Model-C8X-6401)** delivers a precision-engineered solution for maintaining optimal engine performance in off-road vehicles. This set includes a **black thermostat** and a matching **O-ring**, ensuring a secure, leak-free seal for reliable operation in demanding conditions.
Designed for seamless integration, this replacement part adheres to original equipment manufacturer (OEM) specifications, providing a direct fit for Polaris models requiring part numbers **7052352 (Thermostat)** and **5411521 (O-Ring)**. Each unit is manufactured to withstand high temperatures, vibration, and exposure to mud, dust, and harsh weather, extending the lifespan of your vehicle’s cooling system. Order includes **one thermostat** and **one O-ring** for quick and efficient maintenance.
Specifications
- 0: ✔ Compatible with Major Powersports Brands – Designed to fit a wide range of models from Yamaha, Honda, Polaris, Can-Am, TM, John Deere, and more—perfect for ATVs, UTVs, dirt bikes, and side-by-sides.
- 1: ✔ Durable & Built for Tough Terrain – Manufactured from high-quality materials that withstand off-road use, vibration, mud, dust, and harsh weather conditions.
- 2: ✔ Improves Performance & Reliability – Ideal for restoring or enhancing engine response, handling, and overall ride quality with dependable aftermarket parts.
- 3: ✔ OEM-Style Fitment – Precision-engineered to meet or exceed original specifications for seamless integration and hassle-free installation.
- 4: ✔ Great for Maintenance & Upgrades – Whether you're replacing a worn part or upgrading performance, these components keep your machine running at its best.
Ships directly from Amazon warehouses — not currently matched on eBay.
Screw
Exact OEM Stock LowAlso fits 117 other vehicles
- 2011 polaris sportsman-800-efi-6x6-a11cf76aa — Electrical Switches And Sensors And Ecm A11cf76aa
- 2011 polaris sportsman-800-efi-6x6-a11cf76aa — Electrical Switches And Sensors And Ecm A11cf76aa 49atvelect116x6
- 2011 polaris sportsman-800-efi-6x6-a11cf76aa — Electrical Switches Sensors Ecm
- 2011 polaris sportsman-800-efi-6x6-a11cf76aa — Engine Cooling System Thermostat
- 2011 polaris sportsman-800-efi-6x6-a11cf76aa — Engine Cooling System Thermostat A11cf76aa
- 2011 polaris sportsman-800-efi-6x6-a11cf76aa — Engine Oil Pump And Water Pump A11cf76aa
- 2011 polaris sportsman-800-efi-6x6-a11cf76aa — Engine Oil Pump And Water Pump A11cf76aa 49atvoilpump116x6
- 2011 polaris sportsman-800-efi-6x6-a11cf76aa — Engine Oil Pump Water Pump
- 2011 polaris sportsman-800-efi-a11mh76ax-az — Electrical Switches And Sensors And Ecm A11mh76ax Az 49atvelect11sp800
- 2011 polaris sportsman-800-efi-a11mh76ax-az — Electrical Switches Sensors Ecm
- 2011 polaris sportsman-800-efi-a11mh76ax-az — Engine Cooling System Thermostat
- 2011 polaris sportsman-800-efi-a11mh76ax-az — Engine Oil Pump And Water Pump A11mh76ax Az 49atvoilpump116x6
- 2011 polaris sportsman-800-efi-a11mh76ax-az — Engine Oil Pump Water Pump
- 2012 polaris sportsman-800-efi-6x6-a12cf76aa — Electrical Switches And Sensors And Ecm A12cf76aa
- 2012 polaris sportsman-800-efi-6x6-a12cf76aa — Electrical Switches And Sensors And Ecm A12cf76aa 49atvelect116x6
- View all 117 →
Looking for a direct-fit replacement from a compatible aftermarket brand?
Find New-Old-Stock (NOS), open-box deals, or verified salvage teardown parts.
Thermostat w/Bypass
Exact OEM Stock LowAlso fits 59 other vehicles
- 2004 polaris sportsman-600-a04ch59ak-al-an-aq-aw — Cylinder Cylinder Head
- 2004 polaris sportsman-700-a04ch68ak-al-an-ao — Cylinder Cylinder Head
- 2004 polaris sportsman-700-a04ch68ap-aq-au-cu — Manifold Thermostat
- 2005 polaris sportsman-600-a05mh59ak — Cylinder And Cylinder Head A05mh59ak An
- 2005 polaris sportsman-600-a05mh59ak — Cylinder Cylinder Head An
- 2005 polaris sportsman-700-a05mh68ak-an-ad — Engine Cylinder Cylinder Head
- 2005 polaris sportsman-700-efi-a05mh68ac — Manifold And Thermostat A05mh68ac As At Au Aw
- 2005 polaris sportsman-700-efi-a05mh68ac — Manifold Thermostat As At Au Aw
- 2005 polaris sportsman-800-efi-a05mh76ac-au-aw — Manifold Thermostat A05mh76ac At Au Aw
- 2005 polaris sportsman-mv7-a05mh68ap — Cylinder And Cylinder Head A05mh68ap
- 2005 polaris sportsman-mv7-a05mh68ap — Cylinder Cylinder Head
- 2006 polaris sportsman-700-a06mh68aa — Cylinder And Cylinder Head A06mh68aa Ad Af
- 2006 polaris sportsman-700-a06mh68aa — Cylinder Cylinder Head Ad Af
- 2006 polaris sportsman-700-efi-a06mh68aq — Manifold And Thermostat A06mh68aq At Ax Ay Az
- 2006 polaris sportsman-700-efi-a06mh68aq — Manifold Thermostat At Ax Ay Az
- View all 59 →
Looking for a direct-fit replacement from a compatible aftermarket brand?
Find New-Old-Stock (NOS), open-box deals, or verified salvage teardown parts.
Cover, Thermostat w/o Bypass
Exact OEM Stock LowAlso fits 17 other vehicles
- 2012 polaris sportsman-800-efi-6x6-a12cf76aa — Engine Cooling System Thermostat
- 2012 polaris sportsman-800-efi-6x6-a12cf76aa — Engine Cooling System Thermostat A12cf76aa
- 2012 polaris sportsman-800-efi-a12mh76ad-ax-az — Engine Cooling System Thermostat
- 2012 polaris sportsman-forest-800-6x6-a12cf76ff — Engine Cooling System Thermostat
- 2012 polaris sportsman-forest-800-a12mh76ff — Engine Cooling System Thermostat
- 2012 polaris sportsman-forest-800-a12mh76ff — Engine Cooling System Thermostat A12mh76ff
- 2013 polaris sportsman-800-efi-6x6-a13cf76aa — Engine Cooling System Thermostat
- 2013 polaris sportsman-800-efi-6x6-a13cf76aa — Engine Cooling System Thermostat A13cf76aa
- 2013 polaris sportsman-800-efi-a13mh76ad-ax-az — Engine Cooling System Thermostat
- 2013 polaris sportsman-forest-800-6x6-a13cf76ff — Engine Cooling System Thermostat
- 2013 polaris sportsman-forest-800-a13mh76ff — Engine Cooling System Thermostat
- 2014 polaris sportsman-800-efi-6x6-a14cf76aa — Engine Cooling System Thermostat
- 2014 polaris sportsman-800-efi-6x6-a14cf76aa — Engine Cooling System Thermostat A14cf76aa
- 2014 polaris sportsman-800-efi-6x6-forest-a14cf76fa — Engine Cooling System Thermostat
- 2014 polaris sportsman-800-efi-a14mh76aa-ah — Engine Cooling System Thermostat
- View all 17 →
Looking for a direct-fit replacement from a compatible aftermarket brand?
Find New-Old-Stock (NOS), open-box deals, or verified salvage teardown parts.
Engine Cooling System Thermostat A12cf76ff — Frequently Asked Questions
What OEM parts are included in the Engine Cooling System Thermostat A12cf76ff for the 2012 polaris sportsman-forest-800-6x6-a12cf76ff?
The Engine Cooling System Thermostat A12cf76ff for the 2012 polaris sportsman-forest-800-6x6-a12cf76ff includes 4 individual OEM components, each listed below with its exact OEM part number.
How much does the Engine Cooling System Thermostat A12cf76ff cost for the 2012 polaris sportsman-forest-800-6x6-a12cf76ff?
Individual components in this assembly currently range from $41.30, based on live Amazon and eBay listings. See the price comparison below for each part.
Will these OEM parts fit other 2012 polaris sportsman-forest-800-6x6-a12cf76ff model years or trims?
Manufacturers frequently reuse the same physical part across multiple model years and trims, so a given OEM part number can be compatible with more than just this exact vehicle — search the OEM number directly to see every vehicle it fits.
What is the OEM part number for O Ring on the 2012 polaris sportsman-forest-800-6x6-a12cf76ff?
The OEM part number for the O Ring (part of the Engine Cooling System Thermostat A12cf76ff assembly) on the 2012 polaris sportsman-forest-800-6x6-a12cf76ff is 5411521.
Does OEM part 5411521 fit the 2012 polaris sportsman-forest-800-6x6-a12cf76ff?
Yes — OEM 5411521 is listed as the O Ring for the 2012 polaris sportsman-forest-800-6x6-a12cf76ff (2012), part of the Engine Cooling System Thermostat A12cf76ff assembly.
Which parts are included in the Engine Cooling System Thermostat A12cf76ff?
O Ring, Screw, Thermostat w/Bypass, Cover, Thermostat w/o Bypass.
What other vehicles use OEM part number 5411521?
OEM 5411521 (O Ring) also fits 71 other vehicles in this catalog, including 2002 polaris sportsman-700-a02ch68aa-ab-ac-ca-cb — Cylinder Cylinder Head, 2003 polaris sportsman-600-a03ch59aa — Cylinder And Cylinder Head A03ch59aa Af Ag, 2003 polaris sportsman-600-a03ch59aa — Cylinder Cylinder Head Af Ag.