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Thermostat – Fits Yamaha 75-90HP 4-Stroke Outboards (Replaces 6FP-12411-00-00)
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Thermostat – Fits Yamaha 75-90HP 4-Stroke Outboards (Replaces 6FP-12411-00-00)
This replacement thermostat is engineered to fit Yamaha F75B, F90B, and VF90A 4-cylinder outboard engines manufactured between 2016 and 2022. It ensures your engine maintains the correct operating temperature for optimal performance and longevity.
It serves as a direct replacement for Yamaha part number 6FP-12411-00-00 and other aftermarket equivalents, offering a precise fit and reliable function.
- Operating Temperature: 60°C (140°F)
- Installation: Drop-in direct replacement
- Housing Material: High-quality brass for corrosion resistance
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Yamaha | 6FP-12411-00-00 |
| Sierra | 18-3641 |
| WSM | 775-240 |
Compatible Engine Models
Confirm your engine model/year in the table below. For Yamaha owners, here’s a guide to help you identify your engine’s serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F75B | 75 | 4-Stroke | 2017-2022 | 6FP-12411-00-00 | 4-cylinder engine |
| Yamaha | F90B | 90 | 4-Stroke | 2016-2022 | 6FP-12411-00-00 | 4-cylinder engine |
| Yamaha | VF90A Jet | 90 | 4-Stroke | 2016-2022 | 6FP-12411-00-00 | 4-cylinder jet drive |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Outboard Engine Thermostat |
| Installation | Direct replacement |
| Operating Temperature | 60°C (140°F) |
| Housing Material | Brass |
| Fitting Type | Direct fit |
| Country of Manufacture | Japan (OEM); China (some aftermarket) |
| Warranty | Manufacturer-dependent |
Package Contents
1 x Thermostat (6FP-12411-00-00)
Installation Guide
- Disconnect Battery: Ensure the engine is off and disconnect the negative battery cable for safety.
- Locate Housing: Find the thermostat housing on the engine block. It is typically a small dome-shaped cover with a coolant hose attached.
- Drain Coolant: Place a container underneath and partially drain the engine's coolant until its level is below the thermostat housing.
- Remove Cover: Loosen and remove the bolts securing the thermostat housing cover. Note their positions if they are different lengths.
- Remove Old Thermostat: Carefully lift off the cover. Remove the old thermostat and the gasket or o-ring.
- Clean Surfaces: Thoroughly clean the mating surfaces of both the housing and the cover, removing any old gasket material or corrosion.
- Install New Thermostat: Insert the new thermostat, ensuring it is oriented correctly (the spring side usually faces the engine). It is highly recommended to install a new thermostat gasket (not included) at the same time.
- Reinstall Cover: Place the cover back on and tighten the bolts evenly in a star pattern to the manufacturer's specified torque. Do not overtighten.
- Refill & Check: Reattach the hose, refill the cooling system with the appropriate coolant, and reconnect the battery. Run the engine and carefully check for leaks around the housing.
Troubleshooting & FAQ
Q: How do I confirm this thermostat fits my engine?
A: The most reliable method is to match the part number (6FP-12411-00-00) with your engine's service manual. You can also use the compatibility table on this page to check your Yamaha model and year. For further help, consult the Yamaha Serial Number Guide linked above.
Q: What are the common signs of a failing thermostat?
A: A thermostat can fail by sticking open or closed. If it sticks open, your engine may not reach its normal operating temperature, leading to poor performance and fuel economy. If it sticks closed, the engine will overheat, which can cause severe damage.
Q: Some retailers list this part as 62°C, but yours says 60°C. Which is correct?
A: This thermostat is manufactured to the OEM specification of 60°C (140°F). While some aftermarket sources may list a slightly different temperature, our part is designed to open at the correct 60°C for the listed Yamaha engines.
Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.
Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.
Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.
Important Notes
- Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
- This product is an aftermarket replacement part and is not an OEM component.
- Professional installation is recommended to ensure safety and optimal performance.
Why Choose JLM MARINE?
- Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
- Fast Global Shipping: Free delivery worldwide in 5–15 days.
- Direct from Manufacturer: Competitive pricing without compromising quality.
We can ship to virtually any address in the world with free shipping available for most regions.
For our typical US and Canadian customers , our shipping timeframes are as follows:
- Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
- US warehouse shipment: orders will be delivered within 5 days after placing the order.
- China warehouse shipment: orders will be delivered about 12 days after placing the order.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.
As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.
We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.
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