Thermostat (60°C/140°F) for Suzuki 70–300 HP and Yamaha 75–250 HP 4-Stroke Outboards
Thermostat (60°C/140°F) for Suzuki 70–300 HP and Yamaha 75–250 HP 4-Stroke Outboards is backordered and will ship as soon as it is back in stock.
Worry-free returns
Worry-free returns
Shop with confidence. If you’re not completely satisfied, eligible items may be returned within the return window, provided they are unused and in original packaging.
If the return is due to our error or a defective item, we’ll make it right.
Please contact us before returning any item.
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.
Tracking information will be provided once your order ships.
Thermostat (60°C/140°F) for Suzuki 70–300 HP and Yamaha 75–250 HP 4...
Thermostat (60°C/140°F) for Suzuki 70–300 HP and Yamaha 75–250 HP 4-Stroke Outboards is backordered and will ship as soon as it is back in stock.
Product Details
This 60°C (140°F) engine thermostat is a replacement cooling-system component for selected Suzuki 70–300 HP and Yamaha 75–250 HP four-stroke outboard engines. The thermostat helps regulate engine operating temperature by controlling coolant-water flow through the engine's cooling passages as the engine warms up.
This is a single thermostat, not a complete thermostat-housing assembly or a multi-piece service kit. Always compare the original thermostat, housing, seal arrangement, engine model, year, and serial number before ordering.
- Opening temperature: 60°C (140°F).
- Application range: selected Suzuki 70–300 HP and Yamaha 75–250 HP 4-stroke outboards.
- Replacement type: aftermarket direct-replacement thermostat.
- Customer-reference numbers commonly associated with this application include Suzuki 17670-90J00 and Yamaha 67F-12411-01-00.
Part Number References
The following numbers are reference identifiers associated with this thermostat application. Confirm the exact model and engine serial-number range before installation because a number appearing in a cross-reference does not by itself confirm fitment for every engine variant.
| Brand | Reference number | Reference note |
|---|---|---|
| Suzuki | 17670-90J00 | Application reference |
| Suzuki | 17670-90J01 | Related replacement reference; verify against the exact engine |
| Yamaha | 67F-12411-00-00 | Related application reference; verify before ordering |
| Yamaha | 67F-12411-01-00 | Application reference |
| Yamaha | 6CB-12411-00-00 | Related application reference; verify before ordering |
| Sierra | 18-3632 | Aftermarket reference; verify dimensional and application compatibility |
| Mercury/Mariner | 8556761 / 5033721 | Reference numbers reported in aftermarket listings; confirm the exact engine before use |
Engine Compatibility
This thermostat is listed for selected four-stroke outboards in the following general application ranges:
| Brand | Horsepower range | Stroke | Fitment guidance |
|---|---|---|---|
| Suzuki | 70–300 HP | 4-Stroke | Confirm the exact DF model, model year, and serial number. |
| Yamaha | 75–250 HP | 4-Stroke | Confirm the exact F, LF, VF, or other model designation, model year, and serial number. |
Model families can use different thermostats across years, horsepower ratings, production changes, and serial-number ranges. Do not rely on horsepower alone. Use the engine identification plate and compare the original part with the product dimensions and reference numbers before purchase.
Technical Specifications
- Product type
- Engine thermostat
- Opening temperature
- 60°C (140°F)
- Application
- Selected Suzuki 70–300 HP and Yamaha 75–250 HP 4-stroke outboard engines
- Installation type
- Replacement thermostat installed in the original thermostat housing
- Product configuration
- Single thermostat
- Housing or seal components
- Not included unless specifically supplied with the order; verify the required seal or gasket separately
What's in the Box
- 1 × Thermostat
Gaskets, O-rings, seals, housing covers, and other installation hardware are not included unless explicitly stated in the order details.
Installation Notes
- Confirm the engine model, year, serial number, and original thermostat reference before beginning work.
- Allow the engine to cool completely and follow the manufacturer's safety procedures.
- Locate the thermostat housing using the engine service manual.
- Remove the housing cover carefully and note the original thermostat orientation.
- Remove the old thermostat and inspect the housing, gasket, and sealing surfaces for damage or corrosion.
- Clean the mating surfaces without damaging the housing.
- Install the replacement thermostat in the same orientation as the original part.
- Install a correct new gasket or seal if required by the engine manufacturer. The required seal is not included with this single-thermostat product unless specifically stated.
- Reinstall the housing and tighten fasteners to the manufacturer's specified torque.
- Run the engine according to the service manual and check for leaks, abnormal temperature, and warning alarms.
Exact installation steps and fastener torque values vary by engine. Refer to the applicable factory service information for model-specific procedures.
Troubleshooting & FAQ
What temperature does this thermostat open at?
This thermostat is rated to begin opening at 60°C (140°F). The actual operating temperature and temperature-control behavior depend on the engine cooling system and operating conditions.
How can I tell whether my thermostat may be failing?
Possible symptoms include overheating, temperature alarms, unstable temperature, or an engine that takes unusually long to reach its normal operating temperature. Test and diagnose the cooling system according to the engine service manual before replacing parts.
Are seals or gaskets included?
No. This listing is for one thermostat. Check the original installation and the applicable parts diagram to determine whether a gasket, O-ring, or seal must be ordered separately.
Does this fit every Suzuki or Yamaha four-stroke outboard in the horsepower range?
No. The stated horsepower ranges are general application guidance for selected engines, not confirmation for every model or production year. Verify the exact model, year, serial number, and original part number before ordering.
Is this an OEM part?
This is an aftermarket replacement thermostat. The listed manufacturer numbers are customer-facing reference numbers used for application comparison and do not indicate that this product is manufactured by Suzuki, Yamaha, Sierra, Mercury, or Mariner.
Safety & Important Information
- Work only on a completely cool engine and follow the applicable service-manual safety instructions.
- Verify the engine model, year, serial number, original thermostat, and seal arrangement before ordering.
- Do not operate the engine if it overheats, leaks, or displays a temperature warning after installation.
- This product is an aftermarket replacement and is not an OEM component.
About This Replacement Part
This replacement thermostat is intended to restore temperature-control function in compatible four-stroke outboard cooling systems. Correct fitment depends on the specific engine configuration and production range, so careful part-number and model verification is recommended before installation.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
