SKU: 39921803926

Thermostat 50°C – Fits Yamaha 2-Stroke 3HP-250HP Outboards (Replaces 6E5-12411, 688-12411-10, 6H3-12411)

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Description

Thermostat 50°C – Fits Yamaha 2-Stroke 3HP-250HP Outboards (Replaces 6E5-12411, 688-12411-10, 6H3-12411)Thermostat 50C Fits Yamaha 2 Stroke 3HP 250HP Outboards This thermostat is designed for a wide range of Yamaha 2 stroke outboard engines from 3 HP to 250 HP, covering models from 1984 to 2004. It also fits compatible Parsun and Makara Marine 2 stroke models. Engineered to meet original equipment manufacturer (OEM) specifications, this part ensures a direct fit and reliable performance. It replaces multiple Yamaha part numbers, including 6E5 12411, 688

Thermostat 50°C – Fits Yamaha 2-Stroke 3HP-250HP Outboards

This thermostat is designed for a wide range of Yamaha 2-stroke outboard engines from 3 HP to 250 HP, covering models from 1984 to 2004. It also fits compatible Parsun and Makara Marine 2-stroke models.

Engineered to meet original equipment manufacturer (OEM) specifications, this part ensures a direct fit and reliable performance. It replaces multiple Yamaha part numbers, including 6E5-12411, 688-12411-10, and 6H3-12411.

  • Operating Temperature: 50°C (122°F)
  • Installation: Direct replacement with OEM fit
  • Fuel Compatibility: Gasoline

Part Number Cross-Reference

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

Brand Part Number
Yamaha 688-12411-10-00
Yamaha 688-12411-11-00
Yamaha 6H3-12411-11-00
Yamaha 6E5-12411-30-00
Yamaha 6E5-12411-20-00
Yamaha 6E5-12411-10-00
Yamaha 6E5-12411-02
Yamaha 6E5-12411-00
Yamaha 6E5-12411
Aftermarket T15-04000010

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.

Confirm your engine model/year in the table below.

Yamaha 2-Stroke Outboard Engines

Brand Model Rated HP Stroke Years OEM Part No. Notes
Yamaha 3A, 4A 3-4 HP 2-Stroke 6E5-12411-02
Yamaha 5C, 6C/D/J, 8C/J 5-8 HP 2-Stroke 6E5-12411-02
Yamaha 8MSH-0405/0406/0407/0608, 8MSHD-2005 8 HP 2-Stroke 6E5-12411-02
Yamaha 9.9B/C (Enduro), 15B (Enduro) 9.9-15 HP 2-Stroke 6E5-12411-02
Yamaha 20D 20 HP 2-Stroke Up to 1993 6E5-12411-02
Yamaha 25A/B/J/N/V (Enduro and later models) 25 HP 2-Stroke 1993–2001+ 6E5-12411-02
Yamaha C30 30 HP 2-Stroke 1993+ 6E5-12411-30
Yamaha 30D/G/H 30 HP 2-Stroke 6E5-12411-30
Yamaha 40X 40 HP 2-Stroke 6E5-12411-30
Yamaha 50G, 60F, 70B 50-70 HP 2-Stroke 1984-2003 6H3-12411-10
Yamaha 115A/ETN 115 HP 2-Stroke Up to 1985 6E5-12411-30
Yamaha 140A 140 HP 2-Stroke Up to 1985 6E5-12411-30
Yamaha 150A/ETN 150 HP 2-Stroke Up to 1985 6E5-12411-30
Yamaha 175A 175 HP 2-Stroke Up to 1985 6E5-12411-30
Yamaha 200A/ETN 200 HP 2-Stroke Up to 1985 6E5-12411-30
Yamaha 220A 220 HP 2-Stroke Up to 1985 6E5-12411-30
Yamaha 250 250 HP 2-Stroke 1990-2004 6E5-12411-30
Yamaha 130B, 150F, Z150P/Q 130-150 HP 2-Stroke 1994+ 6E5-12411-30
Yamaha 175D, Z175G 175 HP 2-Stroke 1994+ 6E5-12411-30
Yamaha 200F/G, Z200N/P 200 HP 2-Stroke 1994+ 6E5-12411-30
Yamaha 225D/G 225 HP 2-Stroke 1994+ 6E5-12411-30
Yamaha 250A/B 250 HP 2-Stroke 1994+ 6E5-12411-30

Parsun & Makara 2-Stroke Outboard Engines

Brand Model Rated HP Stroke Notes
Parsun Multiple models 3-250 HP 2-Stroke Confirm compatibility with manufacturer
Makara Marine Multiple models 3-250 HP 2-Stroke Confirm compatibility with manufacturer

Technical Specifications

Product Type Thermostat
Installation Direct replacement; OEM fit
Fuel Type Gasoline
Operating Temperature 50°C (122°F)
Other Technical Attributes Manufactured to OEM specifications

Package Contents

1 x Thermostat (Replaces 6E5-12411-30-00, 6E5-12411-02, 688-12411-10-00)

Installation Guide

  1. Ensure the engine is completely cool and disconnect the negative battery terminal for safety.
  2. Locate the thermostat housing on the engine, typically on the cylinder head or block.
  3. Place a drain pan under the engine and carefully drain the coolant to a level below the thermostat.
  4. Remove the bolts securing the thermostat housing cover. Note their positions if they are different lengths.
  5. Gently tap the housing cover to break the seal, then lift it off. Note the orientation of the old thermostat.
  6. Remove the old thermostat and the gasket from the housing.
  7. Thoroughly clean the mating surfaces of the housing and its cover to remove any old gasket material or corrosion.
  8. Install the new thermostat, ensuring its orientation matches the one you removed.
  9. Position the new gasket correctly on the housing.
  10. Reinstall the housing cover and tighten the bolts evenly in a crisscross pattern to the manufacturer-specified torque.
  11. Refill the cooling system with the appropriate coolant mixture.
  12. Reconnect the battery, start the engine, and carefully check for any leaks around the thermostat housing as the engine warms up.

Troubleshooting & FAQ

Q: How do I confirm this thermostat fits my specific Yamaha engine?
A: First, check the "Compatible Engine Models" table on this page. Match your engine's model, horsepower (HP), and year range with the listed OEM part numbers. For further verification, you can use the Yamaha Serial Number Guide to identify your exact model.

Q: What are the common signs of a failing thermostat?
A: Key symptoms include the engine overheating at low speeds, running too cold at normal operating speeds, or taking much longer than usual to reach its proper operating temperature. These can indicate the thermostat is stuck closed or open.

Q: Is this the correct temperature rating for my engine?
A: This is a 50°C (122°F) thermostat. It is crucial to replace your existing thermostat with one that has the same temperature rating specified by your engine's manufacturer to ensure proper performance and prevent engine damage.

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:
  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: 39921803926

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