Aftermarket 72°C Thermostat for Suzuki Outboard DF40, DF50X-K10, DF60 & DF70W-K9
Aftermarket 72°C Thermostat for Suzuki Outboard DF40, DF50X-K10, DF60 & DF70W-K9 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
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Aftermarket 72°C Thermostat for Suzuki Outboard DF40, DF50X-K10, DF...
Aftermarket 72°C Thermostat for Suzuki Outboard DF40, DF50X-K10, DF60 & DF70W-K9 is backordered and will ship as soon as it is back in stock.
Product Details
This 72°C aftermarket thermostat is designed for selected Suzuki 4-stroke outboard applications, including the DF40, DF50X-K10, DF60 and DF70W-K9. It helps regulate engine operating temperature by opening the cooling passage at approximately 72°C (162°F).
This is a single replacement thermostat, not a complete thermostat kit. It is listed as a replacement for Suzuki part numbers 17670-87J00 and 17670-87J01. The company product data also identifies Johnson/Evinrude/OMC reference numbers 5031762 and 0769639 for this replacement application.
- Opening temperature: 72°C (162°F).
- Aftermarket replacement for the listed Suzuki and Johnson/Evinrude/OMC references.
- One thermostat is included.
- Gasket is not included and should be purchased separately if required for your engine.
Part Number Matrix
Use the following references to compare your original part before ordering. Always verify the complete engine model, year and serial-number range.
| Brand or Reference | Part Number | Application |
|---|---|---|
| Suzuki | 17670-87J00 | Replacement reference |
| Suzuki | 17670-87J01 | Thermostat, 72°C reference |
| Johnson/Evinrude/OMC | 5031762 | Replacement reference |
| Johnson/Evinrude | 0769639 | Additional company-listed reference |
Engine & Model Compatibility
The company fitment data identifies the following Suzuki outboard applications. Model suffixes, production years and serial-number ranges must remain together when checking compatibility.
| Brand | Model | Rated HP | Stroke | Years | Reference Part No. | Notes |
|---|---|---|---|---|---|---|
| Suzuki | DF40 | 40 HP | 4-Stroke | Verify model-specific year and serial range | 17670-87J00 / 17670-87J01 | Selected DF40 applications |
| Suzuki | DF50X-K10 | 50 HP | 4-Stroke | 1999–2010 | 17670-87J00 / 17670-87J01 | Confirm the X-K10 suffix |
| Suzuki | DF60 | 60 HP | 4-Stroke | 1998–2009 | 17670-87J00 / 17670-87J01 | Confirm the exact model and serial range |
| Suzuki | DF70W-K9 | 70 HP | 4-Stroke | 1998–2009 | 17670-87J00 / 17670-87J01 | Confirm the W-K9 suffix |
Technical Specifications
- Product Type
- Single aftermarket thermostat
- Opening Temperature
- 72°C (162°F)
- Function
- Regulates engine temperature by opening the cooling passage at the specified temperature
- Replacement References
- Suzuki 17670-87J00 and 17670-87J01; Johnson/Evinrude/OMC 5031762 and 0769639
- Gasket
- Not included
What’s in the Box
- 1 × 72°C thermostat
A gasket is not included. Select the correct gasket separately for the specific engine application if the existing gasket cannot be reused.
Installation Notes
- Make sure the engine is fully cool before beginning work. Follow the safety procedures in the engine service manual.
- Locate the thermostat housing and confirm the replacement part against the original thermostat before removal.
- Place a drain pan beneath the housing to catch water or residual fluid released during disassembly.
- Remove the housing cover and old thermostat. Clean the mating surfaces carefully without damaging the housing.
- Install the new thermostat in the correct orientation according to the engine service manual.
- Install a new gasket if required. The gasket is not included with this product.
- Reinstall the thermostat cover and tighten the fasteners to the manufacturer’s specified torque.
- Restore the cooling system or water supply as appropriate for the engine, then start the engine according to the service manual.
- Check the cooling-water discharge and inspect the thermostat housing for leaks while the engine warms up.
Troubleshooting & FAQ
How do I know if my thermostat may be failing?
Possible symptoms include overheating, an engine that runs cooler than expected, unstable temperature behavior, reduced performance or restricted cooling-water flow. Diagnose the complete cooling system before replacing the thermostat.
Does this thermostat include a gasket?
No. This listing is for one thermostat only. A correct gasket must be purchased separately when required by the engine application.
What is the opening temperature?
This thermostat is specified to open at approximately 72°C (162°F).
Which Suzuki engines does it fit?
The company fitment data lists selected Suzuki DF40, DF50X-K10, DF60 and DF70W-K9 4-stroke applications. Verify the exact model suffix, production year and serial-number range before ordering.
Is this an OEM Suzuki thermostat?
No. This is an aftermarket replacement intended for the listed applications and reference numbers. It is not sold as a genuine Suzuki-branded component.
Can I use the reference numbers to confirm fitment?
Reference numbers are useful for comparison, but they are not a substitute for checking the complete engine model, year, stroke and serial-number range.
Shipping speed & cost
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Coverage and return eligibility are subject to the applicable store policy. Contact support with your order details if you need assistance.
Safety & Important Information
- Confirm the complete engine model, year, stroke and serial-number range before purchase.
- Compare the replacement thermostat with the original part and verify the reference number and physical configuration.
- Do not rely on horsepower alone to determine compatibility.
- This is an aftermarket replacement, not an OEM component.
- Allow the engine to cool completely before servicing the thermostat housing.
- Professional installation is recommended when the required procedure or torque specifications are unfamiliar.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts selected for dependable fit and function in real-world conditions.
- Fast Global Fulfillment — Free standard delivery is available to most regions, with typical transit of 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising attention to materials and quality control.
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