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Description
Thermostat Gasket – Fits Yamaha 75-225 HP Outboard Motors (Replaces 688-12414-A1-00, 688-12414-00-00)Thermostat Gasket Fits Yamaha 75 225 HP Outboard Motors This thermostat cover gasket is designed for a precise fit on a wide range of Yamaha 2 stroke outboard engines, including V4 and V6 models from 75 HP to 225 HP (1992 and later). It serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring a reliable seal for the thermostat housing and preventing coolant leaks. Engineered from high temperature resistant materials, this
Thermostat Gasket – Fits Yamaha 75-225 HP Outboard Motors
This thermostat cover gasket is designed for a precise fit on a wide range of Yamaha 2-stroke outboard engines, including V4 and V6 models from 75 HP to 225 HP (1992 and later). It serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring a reliable seal for the thermostat housing and preventing coolant leaks.
Engineered from high-temperature resistant materials, this gasket provides durability and maintains performance under demanding marine conditions, preventing overheating and ensuring proper engine temperature regulation.
- Installation: Direct replacement for a secure, leak-free fit.
- Fitment: Fits Yamaha V4 & V6 2-Stroke outboards (75-225 HP).
- Included: One thermostat cover gasket.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Yamaha | 688-12414-A1-00 |
| Yamaha | 688-12414-A0-00 |
| Yamaha | 688-12414-00-00 |
| Sierra | 18-0844 |
| Mallory | 9-60003 |
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. |
|---|---|---|---|---|---|
| Yamaha | 75A | 75 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | E75B | 75 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 75C | 75 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | P75 | 75 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 80A | 80 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 85A | 85 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 90E | 90 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 90A | 90 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | B90 | 90 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | C90 | 90 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 100A | 100 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 115E | 115 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 115A | 115 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | E115A | 115 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 115B | 115 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 115C | 115 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | B115 | 115 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | S115 | 115 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 130B | 130 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | S130 | 130 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 140A | 140 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 140B | 140 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 150E | 150 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 150A | 150 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 150C | 150 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 150F | 150 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 150G | 150 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | D150H | 150 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 150J | 150 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 150L | 150 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | D150N | 150 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | Z150P | 150 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | Z150Q | 150 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | S150 | 150 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | SX150 | 150 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | V150 | 150 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | VX150 | 150 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | ProV150 | 150 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 175A | 175 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 175B | 175 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 175D | 175 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 175F | 175 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | Z175G | 175 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | Z175H | 175 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | S175 | 175 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | V175 | 175 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | VZ175 | 175 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 200E | 200 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 200A | 200 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 200B | 200 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 200C | 200 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | Pro V 200 | 200 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 200F | 200 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 200G | 200 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 200J | 200 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | Z200N | 200 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | Z200P | 200 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | S200 | 200 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | SX200 | 200 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | VZ200 (2.6L) | 200 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | Z200 (2.6L) | 200 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 220A | 220 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 225A | 225 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 225B | 225 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
| Yamaha | 225D | 225 | 2-Stroke | 1992 and later | 688-12414-A1-00 |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Thermostat Cover Gasket |
| Installation | Direct replacement |
| Material | High-temperature resistant material |
| Shape | Rectangular |
| Fitment | Yamaha V4, V6 2-Stroke Outboards |
| Warranty | 30-day return/replacement (Amazon) |
| Weight | 0.63 oz (17.9 g) |
Package Contents
- 1 x Thermostat Gasket (688-12414-A1-00)
Installation Guide
- Safety First: Ensure the engine is cool and disconnect the battery's negative terminal.
- Drain Coolant: Partially drain the engine's cooling system to a level below the thermostat housing to prevent spills.
- Locate Housing: Identify the thermostat housing on the engine block.
- Remove Cover: Carefully unbolt and remove the thermostat housing cover. Note the orientation of the bolts if they differ in length.
- Remove Old Gasket: Take out the old, worn gasket. Thoroughly clean both the housing and cover surfaces, removing any residual gasket material or corrosion.
- Install New Gasket: Position the new gasket correctly onto the cleaned surface of the housing.
- Reassemble: Re-install the thermostat cover and tighten the bolts in a crisscross pattern to the manufacturer's recommended torque specification.
- Refill Coolant: Top off the cooling system with the appropriate coolant.
- Final Check: Reconnect the battery. Start the engine, let it reach operating temperature, and carefully inspect the housing for any signs of leaks.
Troubleshooting & FAQ
Q: How do I confirm this gasket fits my Yamaha engine?
A: Check the compatible models table and cross-reference your engine's model and year. This gasket fits a wide range of Yamaha 2-stroke V4 and V6 outboards from 75 HP to 225 HP (1992 and later). Also, verify the OEM part number matches 688-12414-A1-00.
Q: What are the signs that my thermostat gasket is failing?
A: Common signs include coolant leaks around the thermostat housing, engine overheating, or fluctuating engine temperatures. A visible crack or brittle material on the old gasket during inspection also indicates it's time for a replacement.
Q: Is this an original Yamaha OEM part?
A: No, this is an aftermarket part designed to meet or exceed OEM specifications. It replaces Yamaha part numbers 688-12414-A1-00, 688-12414-A0-00, and 688-12414-00-00.
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.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- 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
4.8 ★★★★★
Based on 25 reviews
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Product Reviews
★★★★★ 5
Great Timex Watch
Color: Black/Yellow
This Timex Ironman watch arrived on time and is of great quality. I have used these watches for years and have NO complaints about their longevity, accuracy, or dependability. I will definitely purchase again if needed.
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Reviewed in the United States on May 1, 2026
★★★★★ 5
Item as described.
Color: Dark Blue
A timeless tradition of a great design and useful watch. Have been using this watch design for over a 30 years.
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Reviewed in the United States on May 27, 2026
★★★★★ 5
Great thowback to the OG Ironman, but Amazon's listing gets it undue negativity.
Color: Black/Yellow
Amazon's listing is not very good with it's wording so this watch has gotten undue negative reviews.
I've seen this model listed as both the Endure 30 and the Original 30 Shock, it has 1 alarm with 3 different modes (not 3 separate alarms), 200m WR, ISO shock resistance, (reverse) Indiglo with night mode, 2 time zones, 12/24hr time, 30 lap stopwatch, 24hr countdown timer (repeatable), and day/date (MM.DD or DD.MM). Its basically a slightly updated feature set compared to an Ironman 8-lap.
This watch is great, it's got the look of the original Ironman 8-lap with modern guts. The only minus for me is it could be a little slimmer on the wrist, but I also didn't realize it was shock resistant when I bought it. For comparison, it is a few mm smaller in all dimensions than a G-Shock G2300/G2310/GW2310 series. The band is similar to G-Shocks in that it is formed/molded around the wrist but like the case it's still slimmer in the way it wears around the wrist. Not as slim as an F91W but not as massive as any G-Shock basically. The module has a better display with bigger numbers than the above mentioned Casios. With the exception of the lap memory, the G23## G-Shocks have more features, but the Endure 30 is much easier to use thanks to the display and larger buttons.
If you want 3 alarms you need the very similar Classic 30. The main differences being the Classic has 3 separate alarms (not 1), occasion reminders and 3 time zones but losses the Ironman 8-lap look, the shock resistance and it's only 100m WR. The Classic seems to come in at least two case varieties (chunky or slim), two sizes and many color combinations.
If you only need the Endure 30's features but want a different shape/size/style/slimmness, I believe the Essential 10/30 and BASIC Transit models are functionally the same with only different lap memories, WR, and no shock resistance.
Unfortunately, Timex doesn't easily identify the actual module used in a watch like Casio, so the best way to figure out what features a watch has is to lookup the watch model on the Timex website. Of course the manuals do not always match the marketing names they have used over the years (Endure/Classic/Essential/etc), and each manual covers a few shapes/sizes of watch but just search for the model number in the manuals sections and you'll eventually find the right one. If no manual pops up right away delete digits from the right end of the model number until a manual is found, I believe those last digits only indicate slight variances in style/color that are not important to functionality.
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Reviewed in the United States on May 31, 2021
★★★★★ 1
Good interface but unwearable watch band
Color: Black
This review will be divided into 3 sections: looks, usability, and comfort.
LOOKS
I guess there's not much to say as style is very individual. I think this watch looks good for what you pay for it.
USABILITY
What I liked about this watch is that I could use it right out of the box. I have had basic Timex digital watches before (never this exact interface), and I was able to quickly figure it out. A quick glance at the manual to make sure I wasn't unaware of any features and I had 100% grasp of all the watch's features. The Timex interface puts many others to shame with its user-friendliness. On this model Timex has added a 'guide' on the display that tells you which button will do what-- increase number, decrease number, etc. This is cool. If you're even remotely handy with interfaces, once you learn this one, you'll know it backwards and forwards, and even if you forget, there's the in-display guide.
The functions are standard for a Timex digital-- time and date, stopwatch with lap timing, countdown timer, and alarm. There is a 2nd time zone but no dedicated mode for it. You access it by holding the 'start' button when in the time mode. I like this feature as I occasionally need to know when to call people in 1 particular time zone. But, for example, if you are often switching back and forth between 2 time zones, you will have to reset the time to have the watch display the correct time at all times. And if you need more than 2 time zones, sorry, out of luck. Stopwatch (chrono) is good. Don't use the lap counter much but it seems to work well. Some have complained that the 'start' and 'stop' should be on the same button. Overall, it is a very uncluttered and usable interface.
At first I thought it was very inaccurate at timekeeping, but it must have gotten accidentally reset because over the few months since I set it, it's only a couple seconds off from time.gov. very good timekeeping.
It seems very water resistant. I have taken it swimming, surfing, and it held up fine. I haven't thoroughly tested its shock resistance but it has done some hiking and climbing where it got banged around a bit and it still works.
COMFORT
Unfortunately what the watch has in user interface usability, it totally lacks in comfort. The strap is a huge disaster. It is very rigid and uncomfortable. The 'waffling' or indented designs near the bezel on each side of the strap create areas where the strap digs into the wrist. with any prolonged wearing, it gets worse and worse until your wrist is begging you to take it off.
The strap is just absolutely godawful. I have read reviews where G Shock owners said it was very good, well though out and comfortable. If that is the case, I shudder to imagine what a G Shock is like on the wrist. If constant pinching around sensitive areas on the side of the wrist seems like it would be the kind of thing to bother you, avoid this watch. I tried swapping it for another Timex band, which amazingly enough was uncomfortable it a DIFFERENT area! It seems Timex doesn't put much thought into their bands-- no part of the band should dig into the wrist. That's just obvious.
CONCLUSION
I really want to like this watch, I do. It's good-looking. It's very usable in terms of features. But the strap is terrible, so much so that the watch is unwearable. Unfortunately it took me about a week to figure this out, during which time the watch got sufficient wear so that it is no longer new, returnable condition. I am keeping it, using it as a 'beater' watch in the gym (I put my watch on the ground in the gym). If you purchase it I recommend you wear it for a good few hours while not doing anything that will scratch it, so that you can return it if need be.
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Reviewed in the United States on October 5, 2014
★★★★★ 5
Best purchase ever!!!
Color: G9901: Gold band & Gold dial, Color: G9901: Gold band & Gold dial
The best fit,size, quality,weight and value for the individual in my life. You can see all the moving parts in the watch and he loved it!!! Seriously considering getting more for my kids and another color for him.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 20, 2026