Yamaha 6CE-12411-00-00 Thermostat for Outboard Motor — main product image

Yamaha 6CE-12411-00-00 Thermostat for Outboard Motor

Yamaha

Yamaha 6CE-12411-00-00 Thermostat for Outboard Motor

Name: Yamaha 6CE-12411-00-00 Thermostat for Outboard Motor
Brand: Yamaha
SKU: 6CE-12411-00-00

★★★★★5.0 (9 reviews)

Genuine OEM Yamaha thermostat that restores factory coolant flow regulation and protects against overheating in compatible outboard engines.

$58.57*

✓ In Stock on Amazon.com

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*Price sourced from Amazon.com. Last updated:Jul 14, 2026.Price and availability are subject to change.

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Overview

The Yamaha 6CE-12411-00-00 is a new OEM replacement thermostat for compatible Yamaha outboard motors. The thermostat regulates coolant flow through the engine by remaining closed until coolant reaches the factory-specified operating temperature, then opening to allow circulation through the cooling circuit. This simple function is critical to consistent engine performance: a closed thermostat during warmup prevents overcooling and accelerated wear from incomplete combustion; proper opening under load prevents overheating by enabling full coolant circulation before thermal limits are reached. An OEM part carries the assurance that the opening temperature setpoint, valve travel, and component materials match the original factory specification — variables that aftermarket cross-reference parts may not precisely replicate.

Thermostat replacement is a detail-critical service. The cooling system must be partially disassembled to access the housing, sealing surfaces must be clean, and housing fasteners must be torqued to specification on reassembly — the Yamaha service manual for the specific engine model is the authoritative guide. Thermostat replacement should also prompt inspection of the water pump impeller and cooling hoses: overheating events stress adjacent cooling components, and a degraded impeller can cause recurring overheating even after a new thermostat is installed. At the price of a single OEM thermostat, this is among the highest-return preventive maintenance investments available for an outboard engine — the component cost is negligible relative to the repair cost of head or block damage caused by a chronic overheating failure.

Specifications

Part Type

Thermostat

Application

Outboard Motor

Part Number

6CE-12411-00-00

Pros & Cons

👍 Pros

OEM Yamaha specification ensures the thermostat opens at the factory-calibrated temperature setpoint, maintaining the precise operating temperature range the engine was designed for — no compromise from an aftermarket substitute with an unverified opening temperature
Direct drop-in replacement for the 6CE-12411-00-00 part number eliminates the fitment uncertainty that comes with sourcing a cross-reference equivalent from a third-party supplier
New OEM condition means the wax element, valve seat, and spring are at full factory tolerance, providing reliable temperature-triggered opening and closing across the component's full service life
Restoring a failed thermostat prevents the chronic overheating cycle that accelerates cylinder wall, head gasket, and water pump wear — a low-cost part protecting significantly more expensive downstream components
Purchasing the exact OEM part number avoids the risk of installing a thermostat with an incorrect opening temperature, which can cause either chronic overcooling or insufficient thermal protection depending on the direction of error

👎 Cons

Compatibility is limited to specific Yamaha outboard models using the 6CE-12411-00-00 part number — verify engine model and year against Yamaha's parts fiche before ordering, as the part number is not universal across Yamaha outboard lines
Replacement requires partial disassembly of the engine's cooling system, including draining and refilling — not a dockside repair for first-time outboard owners without basic marine mechanical experience
No installation hardware such as a gasket, o-ring, or sealing compound is included with the thermostat — confirm with the service manual whether replacement seals are needed before beginning the repair
A failed thermostat often indicates underlying cooling system wear that extends beyond the thermostat itself — replacement without inspecting the water pump impeller, hoses, and housing may leave a contributing fault unaddressed
OEM pricing carries a modest premium over aftermarket cross-reference alternatives — budget-focused buyers will find lower per-unit cost in non-OEM parts, though with less certainty on opening temperature specification and material quality

Frequently Asked Questions

How do I confirm this is the correct thermostat for my Yamaha outboard?

Match the part number 6CE-12411-00-00 against your engine's parts fiche, which lists components by model and year. Yamaha's online parts lookup or an authorized Yamaha marine dealer can confirm fitment for your specific engine — do not assume compatibility based on physical similarity alone.

What symptoms indicate the thermostat in my outboard has failed?

Two failure modes are common. A stuck-closed thermostat prevents coolant circulation, causing rapid overheating and alarm activation under load. A stuck-open thermostat allows coolant to flow constantly, causing the engine to run below operating temperature, take abnormally long to warm up, and run with reduced efficiency. Either symptom warrants thermostat inspection.

Can I replace the thermostat myself, or does it require dealer service?

Thermostat replacement is accessible to experienced DIY outboard owners with basic tools and a service manual. However, the cooling system must be partially disassembled and reassembled with correct torque on housing fasteners and a properly seated gasket seal. Owners without prior outboard service experience should have a Yamaha dealer or qualified marine mechanic perform the work to avoid coolant leaks or improper seating.

Is a replacement gasket included with this thermostat?

The listing does not indicate that a gasket is included. Consult the Yamaha service manual for your engine to determine whether the thermostat housing gasket must be replaced during this service — reusing an old gasket on reassembly risks coolant leaks at the housing joint.

Should I replace the water pump impeller at the same time?

In most cases, yes — particularly if the engine has experienced overheating. Water pump impeller vanes can deform or crack under heat stress, reducing cooling flow even after the thermostat is restored. Combining both services in one maintenance event is efficient practice and eliminates the risk of a degraded impeller causing recurring overheating shortly after the thermostat repair.