SouthMarine
0 ratings
Boat Engine Thermostat Kit 66M-12411-00 66M-12411-01 for Yamaha 9.9-70HP | with Gasket 65W-12414-00 62Y-12414-00 for 4-Stroke Outboard Motor, 60C/140F
genuine image
Boat Engine Thermostat Kit 66M-12411-00 66M-12411-01 for Yamaha 9.9-70HP | with Gasket 65W-12414-00 62Y-12414-00 for 4-Stroke Outboard Motor, 60C/140F
SouthMarine Boat Engine Thermostat Kit 66M-12411-00 66M-12411-01 and Gasket 65W-12414-00 62Y-12414-00 for Yamaha 9.9-70hp 4-Stroke Outboard Motor
Boat Engine Thermostat Kit 66M-12411-00 66M-12411-01 for Yamaha 9.9-70HP | with Gasket 65W-12414-00 62Y-12414-00 for 4-Stroke Outboard Motor, 60C/140F
Item #: 39417215

Boat Engine Thermostat Kit 66M-12411-00 66M-12411-01 for Yamaha 9.9-70HP | with Gasket 65W-12414-00 62Y-12414-00 for 4-Stroke Outboard Motor, 60C/140F

Item #: 39417215

IMP 28

Price Details

Excluding Shipping & Custom charges ( Shipping and custom charges will be calculated on checkout )

*All items will import from US

0 ratings Write a review
In stock
us Imported from USA store

QTY:

Order now and get it around Thursday, August 27
Secured transactionsecured transaction

Ubuy works hard to protect your security and privacy. Our advanced payment security system ensures confidentiality by encrypting your information during transmission using AES (Advanced Encryption Standards) and SSL (Secure Socket Layer) protocols. Your payment details are 100% secure as we do not share your payment details with third party sellers.

Our Top Logistics Partners
  • fedex
  • dhl
SouthMarine Boat Engine Thermostat Kit 66M-12411-00 66M-12411-01 and Gasket 65W-12414-00 62Y-12414-00 for Yamaha 9.9-70hp 4-Stroke Outboard Motor
U-Care Warranty:
None
Select a Plan
fast shipping

Fast
Shipping

free return

Free
Return*

secure packaging

Secure Packaging

100% original products

100% Original Products

pci-dss

PCI DSS Compliance

iso certified

ISO 27001 Certified

paypal payment
visa payment
mastercard payment
Note: Step Down Voltage Transformer required for using electronics products of US store (110-120). Recommended power converters Buy Now.

What Stands Out

Perfect Compatibility
Designed specifically for Yamaha 9.9-70hp 4-stroke outboard motors, ensuring seamless integration and reliable performance without compatibility issues.
Complete Kit
Includes essential components like thermostats and gaskets, providing everything needed for a complete replacement, saving time and reducing the need for additional purchases.
Enhanced Efficiency
Optimizes engine cooling and performance, helping to prevent overheating and improve fuel efficiency, which extends the lifespan of your outboard motor.

Product Details

Shop the SouthMarine Boat Engine Thermostat Kit for Yamaha 9.9-70hp Outboard Motor at Ubuy Isle of Man. Includes thermostat and gasket for optimal engine performance.
Package Weight1 Pound

Who Should Buy?

Suitable For
  • Boat Owners

    Perfect for Yamaha outboard motor users needing reliable thermostat replacement for better engine temperature regulation.

  • DIY Mechanics

    Ideal choice for hobbyists looking to perform maintenance independently without expensive professional service fees.

  • Marine Technicians

    Recommended for professionals servicing multiple Yamaha outboards, ensuring quick repairs and reliable performance for customers.

Not Suitable For
  • Inexperienced Users

    Not suitable for those unfamiliar with outboard motor maintenance, as installation may require specific technical skills.

Product Description

Boat Engine Thermostat Kit 66M-12411-00 66M-12411-01 for Yamaha 9.9-70HP | with Gasket 65W-12414-00 62Y-12414-00 for 4-Stroke Outboard Motor, 60C/140F

Have any Query? Chat with us

Customer Questions & Answers

  • Question: What is the purpose of the SouthMarine Boat Engine Thermostat Kit?

    Answer: The SouthMarine Boat Engine Thermostat Kit is designed to maintain optimal engine temperature in Yamaha 9.9-70hp 4-Stroke Outboard Motors. By regulating the flow of coolant, it helps prevent the engine from overheating, ensuring efficient operation and extending engine life. A properly functioning thermostat is crucial to avoid engine damage, which can occur due to excessive heat. Regularly replacing your thermostat kit can significantly impact engine performance and reliability, particularly during long voyages or high-performance activities.
  • Question: Is the SouthMarine thermostat kit compatible with all Yamaha outboard motors?

    Answer: The SouthMarine Boat Engine Thermostat Kit is specifically designed for Yamaha 9.9-70hp 4-Stroke Outboard Motors. Compatibility with models outside this range is not guaranteed, and using an incorrect thermostat may lead to improper cooling and potential engine issues. To ensure reliability, always confirm your motor's model and specifications with the product details before purchase. This will help in maintaining optimal performance and avoid costly repairs from overheating or other related issues.
  • Question: What components are included in the thermostat kit?

    Answer: The SouthMarine Boat Engine Thermostat Kit includes both the thermostat itself (models 66M-12411-00 and 66M-12411-01) and necessary gaskets (models 65W-12414-00 and 62Y-12414-00). These components work together to ensure a leak-proof seal and effective temperature regulation. The gaskets are crucial for maintaining the integrity of the cooling system by preventing leaks. When replacing your thermostat, it's advisable to replace the gaskets simultaneously to avoid future issues associated with cooling system failures.
  • Question: How do I install the SouthMarine thermostat kit?

    Answer: Installing the SouthMarine Boat Engine Thermostat Kit typically involves removing the engine cover, disconnecting the cooling hoses, and replacing the old thermostat with the new one from the kit. Make sure to clean the mounting surface properly before installing the new gaskets to prevent leaks. Carefully reassemble the cooling system and check for any coolant leaks before starting the engine. If you are unfamiliar with engine maintenance, consider consulting a professional for installation. Proper installation is key to ensuring your motor runs smoothly and efficiently.
  • Question: How often should I replace the thermostat in my outboard motor?

    Answer: It is generally recommended to replace the thermostat in your Yamaha 9.9-70hp 4-Stroke Outboard Motor every few seasons or as indicated by your motor's maintenance schedule. Frequent inspection for performance issues, like overheating or erratic temperature readings, may signal the need for earlier replacement. Regular preventative maintenance, including thermostat checks, helps to enhance overall engine reliability, especially if you use your boat heavily or for competitive purposes. Addressing thermostat issues promptly can prevent more significant engine problems down the line.
  • Question: What symptoms indicate a faulty thermostat?

    Answer: Common symptoms of a faulty thermostat include the engine overheating, fluctuating temperature readings, or the motor taking longer than usual to reach an optimal operating temperature. If you experience these signs while using your Yamaha outboard motor, it may be time to consider replacing the thermostat with the SouthMarine kit. Ignoring these issues could lead to severe engine damage. Regular monitoring and maintenance will help ensure your motor remains in peak condition, providing a better overall boating experience.
  • Question: What makes the SouthMarine thermostat kit a reliable choice for boat owners?

    Answer: The SouthMarine Boat Engine Thermostat Kit is known for its durability and compatibility with Yamaha 9.9-70hp 4-Stroke outboard motors. Its OEM specifications ensure that it meets high-quality standards, which many boat owners trust for their engines. The gaskets included help in preventing leaks and maintaining the cooling system's efficiency. Using high-quality components is essential for the longevity and performance of your outboard motor, making this kit a reliable option for those seeking to enhance their boat’s reliability.
  • Question: Can I use the thermostat kit for other brands of outboard motors?

    Answer: The SouthMarine Boat Engine Thermostat Kit is specifically designed for Yamaha 9.9-70hp 4-Stroke Outboard Motors and is not universally compatible with other brands. Each manufacturer's motors may have different specifications for thermostats, and using the wrong kit could result in inadequate cooling and potential engine damage. To ensure optimal performance, always select parts that are specifically designed for your motor's make and model, as this helps maintain efficiency and reliability.
  • Question: How do I know if my current thermostat needs to be replaced?

    Answer: You can determine if your current thermostat needs replacing by monitoring your engine's temperature. If your motor runs hotter than normal or fails to reach the correct operating temperature, it might indicate a malfunctioning thermostat. Additionally, check for any coolant leaks around the thermostat housing, as this can also signify that the gaskets need replacing. Regular inspections and maintenance will help catch these issues early, allowing you to replace the thermostat before significant engine damage occurs.
  • Question: Where can I buy the SouthMarine Boat Engine Thermostat Kit and gaskets?

    Answer: You can purchase the SouthMarine Boat Engine Thermostat Kit 66M-12411-00 66M-12411-01 and Gasket 65W-12414-00 62Y-12414-00 for Yamaha 9.9-70hp 4-Stroke Outboard Motor from Ubuy, which offers a seamless shopping experience and access to various boating and engine parts. Ubuy provides reliable service and ensures that you get the right components for your outboard motor, making it an excellent choice for your purchase.

SouthMarine Thermostats Editorial Review

The SouthMarine Boat Engine Thermostat Kit is an essential replacement for Yamaha 9.9-70hp four-stroke outboard motors. The package comes with thermostats and gaskets, which are designed to fix the engine's water drip and ensure it runs smoothly. The product is easy to install, making it ideal for users who want to make replacements without professional assistance. The manufacturer has provided compatibility information on the product, making it easy for users to determine if it fits their engine.

Customer Reviews & Ratings

1 customers ratings
  • 5 Star
    100%
  • 4 Star
    0%
  • 3 Star
    0%
  • 2 Star
    0%
  • 1 Star
    0%

Review this product

Share your thoughts with other customers

Pros

  • Easy to install
  • Comes with gaskets
  • Works for multiple Yamaha models
  • Provides compatibility information
  • Fixes water drip

Cons

  • May cause thermostat to stay open

Platform Trust & Buyer Confidence

trustpilot logo
4.2/5 9250 + reviews
Read reviews
MA
Mohammad
Verified buyer

“Excellent quality and original too,when ubuy send original things I will appreciate that ,I very satisfied thank you”

23 July 2026 · via Trustpilot
CK
Chitra
Verified buyer

“The order and delivery progress was communicated very well. Package arrived within the estimated time. Products arrived as expected in good condition.”

22-Jul-26 · via Trustpilot
K
kund
Verified buyer

“Good supply of products. Safe payment methods, and shipment worldwide! Genuine products.”

23-Jul-26 · via Trustpilot
OO
Onesi
Verified buyer

“Was my first time buying a product from Ubuy, but I found it so helpful. This is reliable. Gonna place a new order!”

22 July 2026 · via Trustpilot
SJ
SAO JOHN
Verified buyer

“Ubuy is a great online platform to buy stuff. Reliable, fast delivery time and great value for money. I've been using Ubuy online shopping platform for three years now and will continue to do so.”

23 July 2026 · via Trustpilot
Secure Checkout Global Delivery Easy Returns Genuine Products

Important information

  • Limitations : For products shipped internationally, please note that any manufacturer warranty may not be valid; manufacturer service options may not be available; product manuals, instructions, and safety warnings may not be in destination country languages; the products (and accompanying materials) may not be designed in accordance with destination country standards, specifications, and labeling requirements; and the products may not conform to destination country voltage and other electrical standards (requiring use of an adapter or converter if appropriate). The recipient is responsible for assuring that the product can be lawfully imported to the destination country. When ordering from Ubuy or its affiliates, the recipient is the importer of record and must comply with all laws and regulations of the destination country.
  • Not all the products listed on Ubuy are for sale, as Ubuy is a global search engine. Products are subject to export/trade regulations.

IMP 28

Order now and get it around Thursday, August 27

QTY:

Secured transactionsecured transaction

PCI DSS compliant and ISO 27001:2022 certified, with encrypted payments and full buyer protection on every order.

Our Top Logistics Partners
  • fedex
  • dhl
Fastest cross-border delivery

Features & Benefits

  • Temperature: 60℃/140℉
  • Fits Yamaha outboard models: F9.9C, FT9.9D, F13.5A, F15A, F20A, F25A, FT25B, F30A, F40A, F40B, F40F, F50A, FT50B, F60C & FT60B
  • Replaces Thermostat Part OEM Number#: 66M-12411-00 66M-12411-01
  • Includes the Thermostat & Gasket, as shown in the picture
  • Please provide your engine serial number if you are unsure

Ubuy Assurance

Experience worry-free shopping with 100% original products, PCI DSS-compliant payment security, ISO 27001-certified data protection, the fastest cross-border delivery, free returns *, and secure packaging on every order.