Thermostat Gasket – Fits Yamaha 9.9HP/15HP 2-Stroke Outboards (682-12414-A1-00)
Thermostat Gasket – Fits Yamaha 9.9HP/15HP 2-Stroke Outboards (682-12414-A1-00) is backordered and will ship as soon as it is back in stock.
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Thermostat Gasket – Fits Yamaha 9.9HP/15HP 2-Stroke Outboards (682-...
Product Details
Engineered for a precise fit, this Thermostat Gasket for Yamaha 9.9HP/15HP 2-Stroke Outboards (682-12414-A1-00) creates a durable seal to prevent coolant leaks and maintain optimal engine temperature. It is designed for Yamaha 9.9HP and 15HP outboard motors manufactured between 1984 and 2008.
It serves as a direct interchange for Yamaha OEM part numbers 682-12414-A1-00, 682-12414-00-00, and 682-12414-A0-00.
- Installation: Direct replacement fit.
- Engine Compatibility: Designed exclusively for 2-stroke gasoline outboards.
- Material: Constructed from high-quality paper for a durable seal.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 682-12414-A1-00 |
| Yamaha | 682-12414-00-00 |
| Yamaha | 682-12414-A0-00 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha Outboards: This table lists specific compatible Yamaha 2-stroke models. The gasket generally fits 9.9HP and 15HP models from 1984–2008.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Yamaha | 9.9ELHR | 9.9 | 2-Stroke | 1993 | 682-12414-A1-00 |
| Yamaha | 9.9MSHR | 9.9 | 2-Stroke | 1993 | 682-12414-A1-00 |
| Yamaha | 9.9MLHR | 9.9 | 2-Stroke | 1993 | 682-12414-A1-00 |
| Yamaha | 9.9MSHY | 9.9 | 2-Stroke | 2000 | 682-12414-A1-00 |
| Yamaha | 9.9ELRV | 9.9 | 2-Stroke | 1997 | 682-12414-A1-00 |
| Yamaha | 9.9ESHT | 9.9 | 2-Stroke | 1995 | 682-12414-A1-00 |
| Yamaha | 9.9MSHD | 9.9 | 2-Stroke | 2005 | 682-12414-A1-00 |
| Yamaha | 9.9ESHU | 9.9 | 2-Stroke | 1996 | 682-12414-A1-00 |
| Yamaha | 9.9MLHU | 9.9 | 2-Stroke | 1996 | 682-12414-A1-00 |
| Yamaha | 9.9MSH | 9.9 | 2-Stroke | 2007 | 682-12414-A1-00 |
| Yamaha | 9.9MLHV | 9.9 | 2-Stroke | 1997 | 682-12414-A1-00 |
| Yamaha | 9.9ESHS | 9.9 | 2-Stroke | 1994 | 682-12414-A1-00 |
| Yamaha | 9.9ELHU | 9.9 | 2-Stroke | 1996 | 682-12414-A1-00 |
| Yamaha | 15MSHS | 15 | 2-Stroke | 1994 | 682-12414-A1-00 |
| Yamaha | 15MSHD | 15 | 2-Stroke | 2005 | 682-12414-A1-00 |
| Yamaha | 15MSHKZ | 15 | 2-Stroke | 2001 | 682-12414-A1-00 |
| Yamaha | 15MSH | 15 | 2-Stroke | 2008 | 682-12414-A1-00 |
| Yamaha | 15ESHV | 15 | 2-Stroke | 1997 | 682-12414-A1-00 |
| Yamaha | 15ELHR | 15 | 2-Stroke | 1993 | 682-12414-A1-00 |
| Yamaha | 15ESHS | 15 | 2-Stroke | 1994 | 682-12414-A1-00 |
| Yamaha | 15ELHT | 15 | 2-Stroke | 1995 | 682-12414-A1-00 |
| Yamaha | 15MSHW | 15 | 2-Stroke | 1998 | 682-12414-A1-00 |
| Yamaha | 15MLHS | 15 | 2-Stroke | 1994 | 682-12414-A1-00 |
| Yamaha | 15ESHU | 15 | 2-Stroke | 1996 | 682-12414-A1-00 |
| Yamaha | 15MLHT | 15 | 2-Stroke | 1995 | 682-12414-A1-00 |
Technical Specs
- Product Type
- Thermostat Gasket
- Installation
- Direct Replacement
- Fuel Type
- Gasoline
- Housing Material
- Paper
- Product Dimensions
- 4.0" x 5.13" x 0.15"
- Weight
- 0.08 kg (3 ounces)
What’s in the Box
- 1 x Gasket, Cover (Replaces 682-12414-A1-00)
Installation Notes
- Ensure the engine is off and cool. Disconnect the negative battery cable for safety.
- Locate the thermostat housing on the engine block. Place a drain pan underneath to catch any spilled coolant.
- Carefully remove the bolts securing the thermostat housing cover.
- Gently lift off the cover. If stuck, tap it with a rubber mallet—do not pry, as this can damage the mating surfaces.
- Remove the old thermostat gasket and discard it.
- Thoroughly clean both the housing cover and the engine block mating surfaces. Ensure all old gasket material and sealant are removed.
- Place the new gasket into position on the clean housing surface.
- Reinstall the cover, tightening bolts in a crisscross pattern to the manufacturer's specified torque.
- Reconnect the battery, refill coolant, and run the engine, checking for leaks as it warms.
Troubleshooting & FAQ
How do I know if this gasket will fit my specific Yamaha outboard?
This gasket is designed for Yamaha 9.9HP and 15HP 2-stroke models from 1984 to 2008. To confirm a match, please check your engine's model number and year against the detailed compatibility list provided on this page. Do not purchase if your model is not explicitly listed.
Is this gasket suitable for 4-stroke engines?
No, this is a 2-stroke specific part. It is not compatible with any Yamaha 4-stroke outboard models.
What are the signs of a bad thermostat gasket?
A failing thermostat gasket typically causes coolant leaks around the thermostat housing. You might notice dried coolant residue (white or green), active drips, or an engine that is consistently overheating due to coolant loss.
Should I use sealant with this paper gasket?
Generally, new paper gaskets like this one are designed to be installed dry on clean, flat surfaces. Applying sealant can sometimes cause the gasket to slip or create an uneven seal. However, always defer to your engine’s service manual for specific recommendations.
How often should the thermostat gasket be replaced?
It is standard practice to replace the thermostat gasket every time the thermostat itself is replaced or whenever the thermostat housing is removed for any service. This ensures a fresh, reliable seal.
What is the difference between this and a genuine Yamaha OEM part?
This is a high-quality aftermarket replacement, not an OEM part. It is engineered to meet or exceed original equipment specifications for fit, material, and performance, offering a reliable alternative at a better value. It is manufactured in an ISO 9002 certified facility and undergoes batch inspection for quality control.
How fast do you ship and what are the costs?
We provide fast worldwide shipping, with most orders arriving within 5 to 15 days. Standard shipping is free. If available for your location, expedited shipping options will be presented at checkout.
What is your warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal marine use. Should you encounter an issue, please contact our support team with your order number. We accept returns for unused items in their original condition within our standard return window. Please see our full policy page or contact us for instructions.
Safety & Important Info
- Verify images and specifications against your original part before ordering. If anything differs—even if your model is listed as compatible—do not purchase.
- This is an aftermarket replacement component, not a genuine OEM part.
- Professional installation is highly recommended to ensure safety, proper sealing, and optimal engine performance.
About Sea Sierra
- Pro-Grade Standards: We supply marine parts engineered to strict OEM-level tolerances and rigorously tested for real-world reliability.
- Fast Global Fulfillment: We offer free standard delivery to most regions, with typical transit times of just 5–15 days.
- Manufacturer-Direct Value: By working directly with manufacturers, we provide fair pricing without compromising on materials or quality control.
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