Outboard Thermostat for Yamaha 2 Stroke 100-300 HP 60V-12411

Thermostat (50°C) – Fits Yamaha F115/2-Stroke 200-300HP Outboards

This thermostat is a direct-replacement component for select Yamaha 4-stroke and 2-stroke outboard engines. It is engineered to meet original equipment specifications, ensuring proper engine temperature regulation for optimal performance and longevity.

This thermostat assembly fits Yamaha F115 (4-Stroke) and various 200-300 HP VZ/Z-series (2-Stroke) models. It is a direct replacement for Yamaha part numbers 60V-12411-00-00 and 68V-12411-00-00.

• Regulates engine operating temperature at 50°C (122°F).
• Engineered as a direct-fit replacement for the original part.
• Package includes one thermostat.

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 (60V-12411-00-00)

Installation Guide

1. Disconnect Battery: Ensure the engine is off and disconnect the negative battery cable for safety.
2. Drain Coolant: Place a container under the engine and drain the cooling system to a level below the thermostat housing.
3. Locate Housing: Identify the thermostat housing on the engine block or cylinder head.
4. Remove Housing Cover: Loosen and remove the bolts securing the thermostat housing cover.
5. Remove Old Thermostat: Carefully lift out the old thermostat and its gasket or seal. Note its orientation.
6. Clean Surfaces: Thoroughly clean the mating surfaces of the housing and cover, removing any old gasket material or corrosion.
7. Install New Thermostat: Place the new thermostat into the housing in the correct orientation, followed by the new gasket.
8. Re-secure Housing Cover: Re-attach the housing cover and tighten the bolts evenly to the manufacturer's recommended torque specifications.
9. Refill Coolant: Refill the cooling system with the appropriate type and amount of coolant.
10. Reconnect Battery: Reconnect the negative battery cable.
11. Check for Leaks: Start the engine and let it warm up, carefully checking for any coolant leaks around the thermostat housing.
12. Verify Operation: Monitor the engine temperature gauge to ensure it reaches and maintains the correct operating temperature.

Troubleshooting & FAQ

How do I confirm this thermostat fits my Yamaha engine?
Check your engine model and year against the compatibility tables provided. It is also critical to verify that your current thermostat's part number matches one of the cross-referenced numbers, such as 60V-12411-00-00 or Sierra 18-3525.

What is the operating temperature of this thermostat?
This thermostat is designed to open at 50°C (122°F), which meets original equipment specifications for the listed models to ensure proper engine cooling.

What are the signs of a failing thermostat?
Common signs include the engine overheating, the engine running too cold (not reaching its proper operating temperature), erratic temperature gauge readings, or visible coolant leaks around the thermostat housing area.

OEM vs. Aftermarket?
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.

How fast do you ship and how much does it cost?
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.

What is your warranty and return policy?
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.