Thermostat – Fits Yamaha 150-200HP 4-Stroke Outboards (Replaces 6DA-12411-01-00, 6DA-12411-00-00)
Thermostat – Fits Yamaha 150-200HP 4-Stroke Outboards (Replaces 6DA-12411-01-00, 6DA-12411-00-00) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Product Details
This replacement Thermostat – Fits Yamaha 150-200HP 4-Stroke Outboards is engineered to regulate engine temperature for optimal performance. It is designed for a precise fit on Yamaha 4-Stroke outboard models from 150HP to 200HP (including F150, F175, F200, VF150, and VF175 series) manufactured between 2012 and 2023.
It serves as a direct replacement for Sierra part number 18-3636 and Yamaha OEM numbers 6DA-12411-01-00 and 6DA-12411-00-00.
- Installs as a direct OEM-style replacement.
- Regulates engine coolant by opening at 60°C (140°F).
- Built with a durable stainless steel and brass housing.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 6DA-12411-01-00 |
| Yamaha | 6DA-12411-00-00 |
| Sierra | 18-3636 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Fitment is confirmed for the following Yamaha outboard motors.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F150 | 150 | 4-Stroke | 2013–2020 | 6DA-12411-01-00, 6DA-12411-00-00 | |
| Yamaha | F175 | 175 | 4-Stroke | 2014–2020 | 6DA-12411-01-00, 6DA-12411-00-00 | |
| Yamaha | F200 | 200 | 4-Stroke | 2012–2020 | 6DA-12411-01-00, 6DA-12411-00-00 | |
| Yamaha | F150C, LF150C | 150 | 4-Stroke | 2012–2023 | 6DA-12411-01-00, 6DA-12411-00-00 | |
| Yamaha | F175A, F175C, LF175C | 175 | 4-Stroke | 2012–2023 | 6DA-12411-01-00, 6DA-12411-00-00 | |
| Yamaha | F200B, LF200B, F200C, LF200C | 200 | 4-Stroke | 2012–2023 | 6DA-12411-01-00, 6DA-12411-00-00 | |
| Yamaha | VF150, VF150A | 150 | 4-Stroke | 2013–2023 | 6DA-12411-01-00, 6DA-12411-00-00 | SHO models |
| Yamaha | VF175 | 175 | 4-Stroke | 2015–2023 | 6DA-12411-01-00, 6DA-12411-00-00 | SHO models |
Technical Specs
- Product Type
- Outboard Engine Thermostat
- Installation
- Direct OEM replacement
- Temperature Rating
- 60°C (140°F)
- Housing Material
- Stainless Steel/Brass
- Product Dimensions
- Height: 6.0 in; Width: 6.0 in; Length: 6.0 in;
- Operating Temperature
- 60°C (140°F) open temperature
- Warranty
- 1 Year (for aftermarket versions)
- Function
- Regulates engine coolant temperature by controlling water flow
What’s in the Box
- 1 x Thermostat (6DA-12411-01-00)
Installation Notes
- Ensure the engine has completely cooled before beginning work.
- Disconnect the battery as a safety precaution.
- Locate the thermostat housing on the engine block. You may need to remove other components for access.
- Place a drain pan underneath to catch any spilled coolant.
- Carefully remove the bolts securing the housing cover.
- Note the orientation of the old thermostat before removing it from the housing.
- Remove the old thermostat and its gasket. Clean any old gasket material or corrosion from the housing and cover surfaces.
- Install the new thermostat in the same orientation as the old one.
- Place the new gasket into position.
- Re-install the housing cover and tighten the bolts to the manufacturer's specified torque.
- Top off engine coolant if necessary, and check for any leaks after starting the engine.
Troubleshooting & FAQ
How do I know if my thermostat is failing?
Common signs of a faulty thermostat include the engine overheating at low speeds, or the engine temperature gauge not reaching its normal operating range. An overheating alarm or a noticeable change in engine performance can also indicate a problem.
What is the correct operating temperature for this thermostat?
This thermostat is designed to begin opening at 60°C (140°F) to allow coolant to circulate and maintain the engine's optimal operating temperature.
Will this fit my specific engine model, even if it's not listed?
This part is only guaranteed to fit the models specified in the compatibility chart. If your engine is not listed, do not purchase this part. Always cross-reference the OEM part number with your service manual to ensure an exact match.
How often should a marine thermostat be replaced?
Thermostats are a critical maintenance item, especially in saltwater environments. It is recommended to inspect them annually and replace them every 2-3 years, or immediately if you notice any signs of failure or corrosion.
Is a new gasket included?
This listing is for the thermostat only. Gaskets should be purchased separately and replaced whenever the thermostat is serviced to ensure a proper seal.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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