Thermostat (60°C/140°F) – Fits Suzuki, Yamaha, Johnson/Evinrude, Mercury 4-Stroke 70-300HP (Replaces Suzuki 17670-90J00, Yamaha 67F-12411-01-00)
Thermostat (60°C/140°F) – Fits Suzuki, Yamaha, Johnson/Evinrude, Mercury 4-Stroke 70-300HP (Replaces Suzuki 17670-90J00, Yamaha 67F-12411-01-00) is backordered and will ship as soon as it is back in stock.
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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.).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Thermostat (60°C/140°F) – Fits Suzuki, Yamaha, Johnson/Evinrude, Me...
Product Details
This replacement Thermostat (60°C/140°F) – Fits Suzuki, Yamaha, Johnson/Evinrude, Mercury 4-Stroke 70-300HP (Replaces 17670-90J00, 67F-12411-01-00) is engineered to regulate your engine's operating temperature for optimal performance and longevity. It is designed for a wide range of 4-stroke outboard motors from leading brands, including Suzuki DF-series (2001–Current), Yamaha F-series (2001–Current), Johnson/Evinrude 4-strokes (2003–2006), and various Mercury/Mariner EFI models.
It serves as a direct cross-reference for Suzuki 17670-90J00, Yamaha 67F-12411-01-00, Mercury 8556761, and Sierra 18-3632, ensuring a precise fit and restoring proper cooling system function.
- Installs as a direct OEM-equivalent replacement.
- Maintains a consistent engine temperature with a 60°C (140°F) opening rating.
- Essential for preventing engine overheating and ensuring efficient fuel combustion.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Suzuki | 17670-90J00 | |
| Suzuki | 17670-90J01 | |
| Yamaha | 67F-12411-00-00 | Superseded by 67F-12411-01-00 |
| Yamaha | 67F-12411-01-00 | |
| Yamaha | 6CB-12411-00-00 | |
| Mercury/Mariner | 8556761 | |
| Mercury/Mariner | 5033721 | |
| Sierra | 18-3632 | Aftermarket Reference |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Suzuki models, this thermostat fits a wide range of DF series engines from 2001 through 2010 and beyond.
For Yamaha models, it is compatible with many popular 4-stroke outboards from 75HP to 250HP, including VMAX SHO and left-hand rotation variants.
For Mercury/Mariner models, fitment is dependent on the engine serial number. Please verify before ordering.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Suzuki | DF70 | 70 | 4-Stroke | 2009–Up | 17670-90J00/17670-90J01 | |
| Suzuki | DF80 | 80 | 4-Stroke | 2009–Up | 17670-90J00/17670-90J01 | |
| Suzuki | DF90 | 90 | 4-Stroke | 2001–Up | 17670-90J00/17670-90J01 | |
| Suzuki | DF100 | 100 | 4-Stroke | 2009–2010 | 17670-90J00/17670-90J01 | |
| Suzuki | DF115 | 115 | 4-Stroke | 2001–2010 | 17670-90J00/17670-90J01 | |
| Suzuki | DF140 | 140 | 4-Stroke | 2002–2010 | 17670-90J00/17670-90J01 | |
| Suzuki | DF150 | 150 | 4-Stroke | 2006–2010 | 17670-90J00/17670-90J01 | |
| Suzuki | DF175 | 175 | 4-Stroke | 2006–2010 | 17670-90J00/17670-90J01 | |
| Suzuki | DF200 | 200 | 4-Stroke | 2004–2010 | 17670-90J00/17670-90J01 | |
| Suzuki | DF225 | 225 | 4-Stroke | 2004–2010 | 17670-90J00/17670-90J01 | |
| Suzuki | DF250 | 250 | 4-Stroke | 2004–2010 | 17670-90J00/17670-90J01 | |
| Suzuki | DF300 | 300 | 4-Stroke | 2007–2010 | 17670-90J00/17670-90J01 | |
| Yamaha | F75/F75A | 75 | 4-Stroke | 2003–2017 | 67F-12411-01-00 | Supersedes 67F-12411-00-00 |
| Yamaha | F80 | 80 | 4-Stroke | 2001–2003 | 67F-12411-01-00 | |
| Yamaha | F90/F90A | 90 | 4-Stroke | 2003–2017 | 67F-12411-01-00 | |
| Yamaha | F100 | 100 | 4-Stroke | 2001–2003 | 67F-12411-01-00 | |
| Yamaha | F150 | 150 | 4-Stroke | 2004–Current | 67F-12411-01-00 | Multiple model variants including F150A/F150B |
| Yamaha | F200 | 200 | 4-Stroke | 2002–Current | 67F-12411-01-00 | Both inline and V6 variants |
| Yamaha | F225 | 225 | 4-Stroke | 2002–Current | 67F-12411-01-00 | |
| Yamaha | F250 | 250 | 4-Stroke | 2005–Current | 67F-12411-01-00 | |
| Yamaha | VF200 | 200 | 4-Stroke | 2009–2011 | 67F-12411-01-00 | SHO Series |
| Yamaha | VF225 | 225 | 4-Stroke | 2009–2011 | 67F-12411-01-00 | SHO Series |
| Yamaha | VF250 | 250 | 4-Stroke | 2009–2011 | 67F-12411-01-00 | SHO Series |
| Yamaha | LF150 | 150 | 4-Stroke | 2004–Current | 67F-12411-01-00 | Left-hand rotation variant |
| Yamaha | LF200 | 200 | 4-Stroke | 2002–Current | 67F-12411-01-00 | Left-hand rotation variant |
| Yamaha | LF225 | 225 | 4-Stroke | 2002–Current | 67F-12411-01-00 | Left-hand rotation variant |
| Yamaha | LF250 | 250 | 4-Stroke | 2005–Current | 67F-12411-01-00 | Left-hand rotation variant |
| Johnson/Evinrude | BJ90 | 90 | 4-Stroke | 2003–2006 | ||
| Johnson/Evinrude | BJ115 | 115 | 4-Stroke | 2003–2006 | ||
| Johnson/Evinrude | BJ140 | 140 | 4-Stroke | 2004–2006 | ||
| Johnson/Evinrude | BJ200 | 200 | 4-Stroke | 2005–2006 | ||
| Johnson/Evinrude | BJ225 | 225 | 4-Stroke | 2005–2006 | ||
| Johnson/Evinrude | J90 | 90 | 4-Stroke | 2003–2006 | ||
| Johnson/Evinrude | J115 | 115 | 4-Stroke | 2003–2006 | ||
| Johnson/Evinrude | J140 | 140 | 4-Stroke | 2003–2006 | ||
| Johnson/Evinrude | J200 | 200 | 4-Stroke | 2004–2005 | ||
| Johnson/Evinrude | J225 | 225 | 4-Stroke | 2004–2005 | ||
| Mercury/Mariner | 75HP Carb | 75 | 4-Stroke | Serial 0G960500–1B226999 | 8556761/5033721 | |
| Mercury/Mariner | 75HP EFI | 75 | 4-Stroke | Serial 0G1B172291–1B366822 | 8556761/5033721 | |
| Mercury/Mariner | 80HP EFI | 80 | 4-Stroke | Serial 1B227000–1B366822 | 8556761/5033721 | |
| Mercury/Mariner | 90HP Carb | 90 | 4-Stroke | Serial 0G960500 & Up | 8556761/5033721 | |
| Mercury/Mariner | 90HP EFI | 90 | 4-Stroke | Serial 1B172291–1B366822 | 8556761/5033721 | |
| Mercury/Mariner | 100HP EFI | 100 | 4-Stroke | Serial 1B227000–1B366822 | 8556761/5033721 | |
| Mercury/Mariner | 225HP EFI | 225 | 4-Stroke | Serial 0T653945 & Up | 8556761/5033721 |
Technical Specs
- Product Type
- Engine Thermostat
- Installation
- Direct OEM replacement
- Temperature Rating
- 60°C (140°F)
- Engine Compatibility
- 4-Stroke outboard engines
- Housing Color
- Silver/Metallic
- Weight
- 0.25 lbs (0.11 kg)
- Connection
- Direct mount to thermostat housing
- Operating Temperature
- 60°C (140°F) opening temperature
- Warranty
- Varies by retailer, typically 1 year
- Other Technical Attributes
- Essential cooling system component that regulates engine operating temperature
What’s in the Box
- 1 x Thermostat (Replaces 17670-90J00/17670-90J01, 67F-12411-01-00, 6CB-12411-00-00, 5033721, 8556761, 18-3632)
Installation Notes
- Ensure the engine is cool and disconnect the battery's negative terminal.
- Place a drain pan under the engine and drain the cooling system as per your service manual.
- Locate the thermostat housing on the engine block or cylinder head.
- Remove the bolts securing the housing cover. Note their positions if they are different lengths.
- Gently tap the housing if it's stuck, then remove the cover and the old thermostat. Note the thermostat's orientation.
- Clean both the housing and cover mating surfaces thoroughly, removing all old gasket material.
- Install the new thermostat in the correct orientation. A new gasket (not included) is highly recommended.
- Reinstall the housing cover and tighten the bolts to the manufacturer's specified torque.
- Refill the cooling system with the appropriate coolant.
- Reconnect the battery, start the engine, and carefully check for any leaks around the housing as the engine warms up.
Troubleshooting & FAQ
How do I know if my thermostat is failing?
Common signs of a failing thermostat include engine overheating (stuck closed) or the engine failing to reach normal operating temperature (stuck open). You may see a temperature alarm on your gauges, notice poor performance, or experience increased fuel consumption.
Is this the correct temperature for my engine?
This thermostat has a 60°C (140°F) opening temperature, which is the standard specification for the wide range of compatible Suzuki, Yamaha, and Mercury models listed. Always confirm the required temperature for your specific engine model and year in your service manual.
Can I run my engine without a thermostat?
It is not recommended. Running without a thermostat can cause the engine to run too cool, leading to incomplete fuel combustion, carbon buildup, and reduced engine life. It ensures the engine reaches its ideal operating temperature quickly and maintains it.
How often should I replace my outboard's thermostat?
As a preventative maintenance item, it's good practice to inspect and consider replacing your thermostat every 200-300 hours or every 2-3 years, especially if you operate in saltwater environments. Always replace it if you notice signs of failure.
Why are there so many compatible part numbers?
This part is designed to fit engines from multiple manufacturers (Suzuki, Yamaha, Mercury). Each brand uses its own part numbering system. The list shows all the equivalent OEM and aftermarket part numbers that this single thermostat can replace, simplifying your search.
Is a new gasket included with this thermostat?
This package contains the thermostat only. The thermostat housing gasket is sold separately. We strongly recommend installing a new gasket whenever you replace the thermostat to ensure a leak-free 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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