Outboard Thermostat 50°C (122°F) – Fits Yamaha 2-Stroke & 4-Stroke 100-300 HP (Replaces 60V-12411-00-00, 68V-12411-00-00)

Outboard Thermostat 50°C (122°F) – Fits Yamaha 2-Stroke & 4-Stroke 100-300 HP

This replacement engine thermostat is engineered for select Yamaha outboard motors. It is compatible with various Yamaha 2-Stroke VZ/Z-series models (200–300 HP) from 2003–2009 and 4-Stroke F115 & LF115 models from 2000–2014.

This component is a direct replacement for Yamaha part numbers 60V-12411-00-00 and 68V-12411-00-00, as well as aftermarket parts including Sierra 18-3525, GHmarine 60V12411, and RecMar REC60V-12411-00-00.

• Regulates engine temperature at a stock 50°C (122°F).
• Engineered for direct replacement, ensuring OEM-level fit and function.
• Includes a thermostat and a new thermostat seal for a complete installation.

Part Number Cross-Reference

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

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.

Yamaha 2-Stroke Models

Yamaha 4-Stroke Models

Technical Specifications

Package Contents

• 1 x Thermostat (Replaces 60V-12411-00-00)
• 1 x Thermostat Seal (Replaces 67F-12412-00-00) Note: This seal is included with our kit but may not be included with the OEM part.

Installation Guide

1. Safety First: Disconnect the engine's battery and ensure it is completely cool.
2. Drain Coolant: Partially drain the engine's cooling system so the coolant level is below the thermostat housing.
3. Access Thermostat: Locate and unbolt the thermostat housing cover. You may need to remove other components for access.
4. Remove Old Parts: Carefully lift out the old thermostat and its seal. Clean any residue from the housing and cover surfaces.
5. Install New Parts: Insert the new 50°C thermostat into the housing, ensuring correct orientation. Place the new seal correctly in its groove.
6. Reassemble: Securely fasten the housing cover, tightening bolts to the manufacturer's specified torque.
7. Final Checks: Refill the cooling system with the proper coolant. Reconnect the battery, start the engine, and check for leaks as it warms up to operating temperature.

Troubleshooting & FAQ

Q: How do I confirm this thermostat fits my engine?

A: The most reliable method is to match your engine's model and year to our compatibility tables. You can also cross-reference your existing thermostat's part number with the numbers listed in our "Part Number Cross-Reference" section. For Yamaha owners, our Yamaha Serial Number Guide can help you identify your model.

Q: What is the difference between Yamaha part 60V-12411-00-00 and 68V-12411-00-00?

A: The part number 68V-12411-00-00 is the official supersession for 60V-12411-00-00. Both parts are identical in form, fit, and function, and are completely interchangeable for all listed applications.

Q: What are the symptoms of a failed outboard thermostat?

A: A thermostat can fail in two ways. If it's stuck open, your engine may run too cool and fail to reach its proper operating temperature, leading to poor performance and increased engine wear. If it's stuck closed, the engine will overheat, which can cause significant damage.

Q: Does this aftermarket kit include the thermostat seal?

A: Yes, our kit includes both the thermostat and the required seal (replaces OEM part 67F-12412-00-00). This is a value-add, as the seal is often sold separately with OEM parts.

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.