Thermostat – Fits Yamaha 150-200HP Outboards (Replaces 6DA-12411-01-00, 6DA-12411-00-00)
Thermostat – Fits Yamaha 150-200HP 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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Delivery and Shipping
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Thermostat – Fits Yamaha 150-200HP Outboards (Replaces 6DA-12411-01...
Thermostat – Fits Yamaha 150-200HP Outboards (Replaces 6DA-12411-01-00, 6DA-12411-00-00) is backordered and will ship as soon as it is back in stock.
Product Details
This Thermostat – Fits Yamaha 150HP, 175HP, 200HP Outboards is engineered for Yamaha 4-Stroke 150–200 HP outboard motors from approximately 2012–2018, including F150, F175, F200, VF150, and VF175 series engines. It is a critical component that ensures your engine maintains the correct operating temperature for optimal performance, longevity, and fuel efficiency.
This part serves as a direct cross-reference for Yamaha part numbers 6DA-12411-01-00 and 6DA-12411-00-00, and interchanges with Sierra 18-3636.
- Designed for a direct, OEM-equivalent installation.
- Features a high-grade, corrosion-resistant housing for durability in harsh marine environments.
- Maintains a precise operating temperature of 60°C (140°F) as per factory specifications.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Superseded By | Notes |
|---|---|---|---|
| Yamaha | 6DA-12411-01-00 | Current Part Number | |
| Yamaha | 6DA-12411-00-00 | 6DA-12411-01-00 | |
| Sierra | 18-3636 | Aftermarket Interchange |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This thermostat is specifically designed for select Yamaha 4-Stroke outboard models.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Yamaha | F150C, LF150C | 150 | 4-Stroke | 2017 | 6DA-12411-01-00, 6DA-12411-00-00 |
| Yamaha | VF150 | 150 | 4-Stroke | 2013–2017 | 6DA-12411-01-00, 6DA-12411-00-00 |
| Yamaha | VF150A | 150 | 4-Stroke | 2018 | 6DA-12411-01-00, 6DA-12411-00-00 |
| Yamaha | F175C, LF175C | 175 | 4-Stroke | 2017 | 6DA-12411-01-00, 6DA-12411-00-00 |
| Yamaha | F175A | 175 | 4-Stroke | 2014–2018 | 6DA-12411-01-00, 6DA-12411-00-00 |
| Yamaha | VF175 | 175 | 4-Stroke | 2015–2018 | 6DA-12411-01-00, 6DA-12411-00-00 |
| Yamaha | F200B, LF200B | 200 | 4-Stroke | 2012–2018 | 6DA-12411-01-00, 6DA-12411-00-00 |
| Yamaha | F200C, LF200C | 200 | 4-Stroke | 2013–2018 | 6DA-12411-01-00, 6DA-12411-00-00 |
Technical Specs
- Product Type
- Thermostat
- Installation
- Direct OEM replacement
- Housing Material
- High-grade corrosion-resistant housing
- Operating Temperature
- 60°C (140°F)
- Other Technical Attributes
- Located in engine cooling system
What’s in the Box
- 1 x Thermostat (Replaces 6DA-12411-01-00)
Installation Notes
Replacing the thermostat is a standard maintenance task. Always consult your engine's service manual for detailed instructions. The general steps are:
- Ensure the engine is off and cool. Disconnect the battery.
- Locate the thermostat housing on the engine block or cylinder head.
- Place a drain pan underneath and remove the housing cover bolts.
- Carefully remove the old thermostat and gasket. Note its orientation.
- Clean the housing and cover mating surfaces thoroughly, removing all old gasket material.
- Install the new thermostat in the same orientation as the original.
- Fit a new gasket (not included) onto the housing.
- Reinstall the housing cover and tighten the bolts to the manufacturer's specified torque.
- Reconnect all hoses, refill the cooling system, and reconnect the battery.
- Start the engine and carefully check for any leaks as it warms up.
Troubleshooting & FAQ
How do I know if this thermostat fits my Yamaha engine?
The most reliable method is to match your engine's model and year to the compatibility table. Also, verify that your old part number matches one of the references (6DA-12411-01-00, 6DA-12411-00-00, or Sierra 18-3636).
What are the signs of a faulty thermostat?
A thermostat can fail "open" or "closed." If it fails open, the engine will run too cool, leading to poor fuel economy and carbon buildup. If it fails closed, the engine will overheat, which can cause severe damage. An engine alarm or erratic temperature gauge readings are key indicators.
Is a gasket included with this thermostat?
No, this listing is for the thermostat only. It is strongly recommended to use a new gasket during installation to ensure a proper seal and prevent leaks. Gaskets are sold separately.
How often should I replace my outboard's thermostat?
sThermostats are a routine maintenance item. For engines used in saltwater, it's a good practice to inspect or replace them every 1-2 years (or 200-300 hours) to prevent them from seizing due to corrosion. Refer to your owner's manual for specific service intervals.
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.
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