Thermostat Repair Service Kit – Fits Yamaha 4-Stroke 150 HP Outboard Motors

Thermostat Repair Service Kit – Fits Yamaha 4-Stroke 150 HP Outboard Motors

This thermostat repair kit is designed for Yamaha 4-Stroke 150 HP (2004–2018) F150/LF150 series outboard engines. It provides a reliable, direct-fit solution for maintaining correct engine operating temperature. The kit is compatible with thermostat housing models 67F-12411 and 6CB-12411.

This kit serves as a direct replacement for multiple OEM and aftermarket parts, including Yamaha 67F-12411-00-00/67F-12411-01-00, Yamaha 6CB-12411-00-00, Sierra 18-3632, Suzuki 17670-90J00, Mercury/Quicksilver 8M6010296, and Red Rhino YA-T14.

• Complete Kit: Includes the thermostat, gasket, and seal for a full replacement.
• Precise Temperature Control: Rated to operate at 60°C (140°F) to ensure optimal engine performance.
• Simple Installation: Designed as a direct drop-in replacement for the original components.

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.

Technical Specifications

Package Contents

• 1 × Thermostat (Replaces 67F-12411)
• 1 × Thermostat Housing Gasket (Replaces 63P-12414)
• 1 × Thermostat Seal

Installation Guide

1. Safety First: Ensure the engine is off and cool. Disconnect the negative battery cable.
2. Drain Coolant: Place a suitable container under the engine and carefully drain the cooling system.
3. Access Housing: Locate the thermostat housing on the engine block. Remove any components obstructing access.
4. Remove Cover: Loosen and remove the bolts securing the thermostat housing cover.
5. Extract Old Parts: Carefully remove the old thermostat and gasket. Note the orientation of the thermostat.
6. Clean Surfaces: Thoroughly clean the mating surfaces of the housing and cover, removing all old gasket material.
7. Install New Parts: Place the new thermostat into the housing in the correct orientation, followed by the new gasket.
8. Secure Cover: Re-install the housing cover and tighten the bolts evenly to the manufacturer's specified torque.
9. Refill System: Refill the cooling system with the recommended coolant.
10. Final Checks: Reconnect the battery cable. Start the engine and let it warm up, checking carefully for any leaks around the housing.

Troubleshooting & FAQ

How do I confirm this kit will fit my engine?
First, check the "Compatible Engine Models" table to see if your Yamaha model and year range are listed. Next, use the "Part Number Cross-Reference" table to see if our part matches a known part number for your engine. Finally, compare the product photos to your existing part.

What are the signs of a failing thermostat?
Common symptoms include the engine overheating at low speeds, running too cool (not reaching operating temperature on the gauge), or erratic temperature gauge readings. A stuck-open thermostat can cause poor fuel efficiency, while a stuck-closed one will lead to overheating.

What is the operating temperature of this thermostat?
This thermostat is rated to open at 60°C (140°F), matching OEM specifications for the listed Yamaha engines to ensure proper engine temperature regulation.

Is the thermostat housing included?
No, this is a repair kit that includes the essential service components: the thermostat itself, the housing gasket, and the thermostat seal. The metal housing is not included.

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.