SKU: 34558005581

Thermostat 143°F (62°C) – Fits Yamaha 2-Stroke 9.9-55 HP (Replaces 6F5-12411-01, 6F5-12411-02, 6F5-12411-03)

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Description

Thermostat 143°F (62°C) – Fits Yamaha 2-Stroke 9.9-55 HP (Replaces 6F5-12411-01, 6F5-12411-02, 6F5-12411-03)Thermostat 143F (62C) Fits Yamaha 2 Stroke 9. 9 55 HP (Replaces 6F5 12411 01, 6F5 12411 02, 6F5 12411 03) This thermostat is designed for a wide range of Yamaha 2 Stroke outboards from 9. 9 to 55 HP, manufactured between 1986 and 1997. This includes specific models such as the 9. 9 15 HP (19861995), C25 C30 (19901997), C40 C55 (19901997), and the CV25 CV30 CV40 CV55 series (19891990). It serves as a direct replacement for Yamaha parts 6F5 12411 01 00,

Thermostat 143°F (62°C) – Fits Yamaha 2-Stroke 9.9-55 HP (Replaces 6F5-12411-01, 6F5-12411-02, 6F5-12411-03)

This thermostat is designed for a wide range of Yamaha 2-Stroke outboards from 9.9 to 55 HP, manufactured between 1986 and 1997. This includes specific models such as the 9.9/15 HP (1986–1995), C25/C30 (1990–1997), C40/C55 (1990–1997), and the CV25/CV30/CV40/CV55 series (1989–1990).

It serves as a direct replacement for Yamaha parts 6F5-12411-01-00, 6F5-12411-02-00, and 6F5-12411-03-00, as well as aftermarket equivalents like Sierra Marine 18-3625 and Quicksilver 814554T01.

  • Includes one thermostat and one O-ring gasket for a complete installation.
  • Engineered for a precise 143°F (62°C) opening temperature.
  • Designed for direct OEM replacement, ensuring a straightforward installation process.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Brand Part Number Superseded By Notes
Yamaha 6F5-12411-01-00 6F5-12411-02-00
Yamaha 6F5-12411-02-00 6F5-12411-03-00
Yamaha 6F5-12411-03-00 Current
Sierra Marine 18-3625 Aftermarket
Quicksilver 814554T01 Aftermarket

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.

For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Yamaha 2-Stroke Outboards

Brand Model Rated HP Stroke Years OEM Part No. Notes
Yamaha 9.9, 9.9EL, 9.9ES 9.9 2-Stroke 1986–1995 6F5-12411-01/02/03
Yamaha 9.9L, 9.9S 9.9 2-Stroke 1986–1990 6F5-12411-01/02/03
Yamaha 9.9M 9.9 2-Stroke 1991–1995 6F5-12411-01/02/03
Yamaha 15, 15EL, 15ES 15 2-Stroke 1986–1995 6F5-12411-01/02/03
Yamaha 15L, 15S 15 2-Stroke 1986–1990 6F5-12411-01/02/03
Yamaha C25EL 25 2-Stroke 1991–1997 6F5-12411-01/02/03
Yamaha C25ML, C25MS 25 2-Stroke 1993–1997 6F5-12411-01/02/03
Yamaha CV25EL, CV25EM 25 2-Stroke 1990 6F5-12411-01/02/03
Yamaha C30EL 30 2-Stroke 1991–1992 6F5-12411-01/02/03
Yamaha CV30EL 30 2-Stroke 1989–1990 6F5-12411-01/02/03
Yamaha C40EL 40 2-Stroke 1991–1997 6F5-12411-01/02/03
Yamaha C40MS, C40PL 40 2-Stroke 1992–1997 6F5-12411-01/02/03
Yamaha C40ML 40 2-Stroke 1994–1995 6F5-12411-01/02/03
Yamaha CV40EL 40 2-Stroke 1990 6F5-12411-01/02/03
Yamaha C55EL 55 2-Stroke 1991–1995 6F5-12411-01/02/03
Yamaha CV55EL 55 2-Stroke 1989 6F5-12411-01/02/03

Mercury/Mariner Compatibility (Crossover Application)

Brand Model Rated HP Stroke Years OEM Part No. Notes
Mercury/Mariner 9.9 9.9 2-Stroke 1979–1986 814554T01 Crossover application
Mercury/Mariner 15K, 20C, 25C 15-25 2-Stroke 1988–1998 814554T01 Crossover application
Mercury/Mariner 25K, 40C, K40, 40 25-40 2-Stroke 1986–1998 814554T01 Crossover application
Mercury/Mariner 55 55 2-Stroke 1984–1985 814554T01 Crossover application

Technical Specifications

Specification Value
Product Type Thermostat
Temperature Rating 62°C (143°F)
Installation Direct OEM replacement
Fuel Type Gasoline (Petrol)
Housing Material High-grade corrosion-resistant metal
Operating Temperature 62°C (143°F) opening temperature
Warranty Manufacturer dependent (typically 1 year)

Package Contents

  • 1 x Thermostat (Replaces 6F5-12411-03-00)
  • 1 x O-ring Gasket

Installation Guide

  1. Ensure the engine is completely cool before starting work.
  2. Disconnect the negative battery cable to prevent accidental starting.
  3. Locate the thermostat housing on the engine block. Place a drain pan below it to catch any coolant.
  4. Carefully remove the bolts securing the housing cover. A light tap may be needed to break the seal.
  5. Remove the old thermostat and gasket. Note the orientation of the thermostat for correct placement of the new one.
  6. Thoroughly clean the mating surfaces of the housing and its cover, removing all old gasket material.
  7. Install the new thermostat and O-ring gasket, ensuring the thermostat is seated correctly.
  8. Re-install the housing cover and tighten the bolts evenly to the manufacturer-specified torque. Do not overtighten.
  9. Reconnect the battery cable.
  10. Start the engine, let it warm up, and carefully check for any leaks around the thermostat housing.

Troubleshooting & FAQ

How do I confirm this thermostat fits my engine?
A: Check the "Compatible Engine Models" and "Part Number Cross-Reference" tables on this page. It is crucial to match your engine's model, year, and original part number to ensure correct fitment.

What are the signs of a faulty thermostat?
A: Common signs of a failing thermostat include the engine overheating at low speeds, the engine taking too long to reach its normal operating temperature, or an erratic temperature gauge reading.

Is this a 60°C or 62°C thermostat?
A: This thermostat is rated to open at 62°C (143°F). While some OEM parts may vary slightly, this temperature is specified for optimal performance in the listed engine models.

OEM vs. Aftermarket?
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.

How fast do you ship and how much does it cost?
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.

What is your warranty and return policy?
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.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 34558005581

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4.5 ★★★★★
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Atlas
Los Angeles, US
★★★★★ 5
Great! This surge protector is well designed and built for specific needs.
Nice surge protector/power strip. Good layout of outlets and the one spaced apart is really good. I also love the fact it comes with not two or three USB outlets, but four of them! This is great because there is plenty of room to plug in other devices. The tiny led lights are very small but do light up enough to see that the device is on. The on/off switch works great too and was a must have for my setup. 5 ft of cord length is just what I needed to mount the strip on the wall. (Install screws included) The flat angled plug for the wall is also just what I needed so the design here is perfect. A great value!
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Reviewed in the United States on September 16, 2025
J
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J. Rew
Massapequa, US
★★★★★ 5
All The Right Features, and Well-Made
This power strip had everything I was looking for: 6 ft. cord, right-angle plug, at least 2 USB ports, white plastic case, wall-mountable, and at least 4 AC power outlets. All of that might sound pretty straightforward, but this TROND power strip is one of the very few models that meets all the criteria. Here's what I like about power strips in general, and this TROND model specifically: 1. Right-angle plug. A must in my book. Get a right-angle plug whenever possible. They are almost always more convenient and better-looking than straight standard plugs. 2. At least 1 transformer-spaced outlet. If the AC outlets are all too close together, you'll end up sacrificing 1 or 2 of them with a "wall wart" transformer. Just about everybody is plugging in at least one of these outlet-hogging transformers these days. 3. USB power ports. Like transformers, just about everybody has USB-powered stuff to plug in. If you don't have USB ports built into the power strip, then you have to use the USB power adapter which hogs up an AC outlet. I've got at least 2 USB devices to plug into this power strip at any given time, so having the built-in ports is very convenient. Another must in my book. I also like this TROND model for the little touches that make it a bigger value than the price suggests: 1. Includes mounting screws. What? Wasn't expecting that. Very cool. 2. Includes a template for drilling the mounting holes. What? I've never even seen that before. Even cooler. 3. An actual user's manual - in English - and well-written. That blew me away. I totally don't need a user's manual for a power strip, but it was very classy to see it in the box. Well played, TROND. 4. Expensive-looking power switch and power light. This power strip is much better looking than other cheap strips. The plastic is high-quality and "Apple" looking, the power switch is a cut above the generic switches in this price range, and the power indicator light a slick hidden LED that makes the whole package feel high-end. I have expensive power strips from Monster, Belkin, and Tripp-Lite, and this TROND unit appears better made and has fancier features. I'll definitely buy another TROND power strip when the time comes.
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Reviewed in the United States on December 5, 2016
E
Verified Purchase
E. Jackson
Battle Creek, US
★★★★★ 5
Perfect when you need length.
Color: Black, Size: 15FT Flat Plug
Works great, the ports are perfect, so no more cubes.
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Reviewed in the United States on May 5, 2026
R
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Rick A
Battle Creek, US
★★★★★ 4
Nice strip, wish it had a power on indicator
Color: Black, Size: 6FT Flat Plug
My first strip was DOA, and seemed to have been returned to Amazon. I say this because I was given a replacement and the packaging was different. First it was shrink wrapped, the first device I received was not. Second, the internal packaging was different. I scrapped my original review, and this review is based upon the working strip. This is an attractive power strip with 4 USB charger ports. I like the wall mount holes on both ends that provide a more secure means of attaching the strip to something. Most chargers simply have holes on the back to hang over a screw, this one you can actually fasten to something. The position of the outlets is good for clunky older power blocks provided they aren't too wide. They don't come close to interfering with the usb ports, ensuring you can easily plug in 4 usb cords and 4 power cords without having them get tangled up. My chief dislike are the lack of any power indicator. Almost every power strip I have owned in the last 30 years had some visible way to tell the strip was turned on. The other thing is the indicator to show which side of the power switch is on. The off side has a very visible white dot, which would probably make most people believe that was the "ON" position, it is actually the off position. The on position is marked by a raised black bar(or perhaps it is a 1) which is difficult to see. I think I would have just painted the traditional "on" icon next to the power on end of the switch. Again, a power indicator here would have made all the difference.
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Reviewed in the United States on March 14, 2018
C
Verified Purchase
craig muir
San Leandro, US
★★★★★ 5
terrific, low cost power management tool
Color: Black, Size: 6FT Flat Plug, Color: Black, Size: 6FT Flat Plug
I noticed that most of the power outlets I use on a regular basis are behind large pieces of furniture. Every modern device requires at least a little power (even if only at intervals) and many of them have to be periodically unplugged to be rebooted. This invariably leads to a bulky power strip/surge protector at every usage location. Most power strip/surge protectors are very bulky and made to sit on the floor, often in a difficult location for routine access. Unfortunately, “unplugging” from a power strip requires holding the strip firmly in place while simultaneously pulling on the plug. With the strip in a difficult location and the fact that it must be restrained to remove the plug, I typically need a scotch to even attempt it. If that weren't bad enough, most devices use an AC adapter of various different sizes, shapes and orientations. The differences are odd enough that they look like a heterogeneous collection of "rugrats". This further magnifies the problem because power strips are never devised for the space requirements of rugrats. Most power strips assume that everything is a standard 2 or 3 prong plug, lined up in military fashion. So, to make a power strip work, it must often be combined with a variety of cube taps, shifting the vertical dimensions of many outlets to accommodate the different rat dimensions. In some cases, power strips start looking like tenement slums. Power strips that attempt to accommodate the dimensions of rugrats are even bulkier and more difficult to use. The overall problem was difficult enough that I recently decided to just sacrifice the furniture. This surge protector power strip has a very low profile with two screw slots at either end. There are locations on all outlet-blocking furniture where the strips can be screw-attached (see photo). This solves nearly all the problems: (a) the strip is convenient to someone seated in the chair or laying on the bed; (b) it’s strongly secured meaning the plugs can be easily removed and replaced with one hand; (c) it has one wide-spaced outlet for the odd rugrat; and (d) it has multiple USB ports with one ‘C’ type charging port, thus eliminating one rugrat. Given all that and that fact that it’s very reasonably priced, I couldn’t be happier.
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Reviewed in the United States on September 1, 2023

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