18-3524 Thermostat for Yamaha VZ200 V225 VZ250 Z250 LZ250 Z300 LZ300 F115 LF115 | JLM Marine

Thermostat for Yamaha VZ200 V225 VZ250 Z250 LZ250 Z300 LZ300 F115 LF115 | JLM Marine

This 50℃ (122°F) thermostat is engineered for Yamaha outboard engines, including 2-stroke models VZ200, V225, VZ250, Z250, LZ250, Z300, LZ300 and 4-stroke F115, LF115 motors. It ensures precise temperature regulation for reliable performance across a wide range of horsepower ratings from 115 HP to 300 HP.

This aftermarket replacement directly cross-references Yamaha OEM part numbers 60V-12411-00-00 and 68V-12411-00-00, as well as Sierra Marine 18-3524. It offers seamless compatibility with original equipment specifications.

• Designed for both 2-stroke (200–300 HP) and 4-stroke (115 HP) Yamaha outboards
• Operating temperature: 50℃ / 122°F
• Direct-fit replacement for reliable cooling system performance

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

Your purchase includes the following component:

• 1 × 50℃ (122°F) Outboard Thermostat

Installation Guide

1. Disconnect the battery and allow the engine to cool completely before beginning work.
2. Locate the thermostat housing on your Yamaha outboard engine. Consult your service manual for the exact position.
3. Drain the cooling system to prevent coolant spillage during removal.
4. Remove the bolts or fasteners securing the thermostat housing cover and carefully lift it off.
5. Extract the old thermostat, noting its orientation for correct installation of the new unit.
6. Clean the mating surfaces of the housing and cover thoroughly, removing all old gasket material and debris.
7. Install the new thermostat in the same orientation as the original, ensuring the temperature-sensing element faces the correct direction.
8. Apply a new gasket or sealant as specified by the manufacturer to ensure a proper seal.
9. Reinstall the thermostat housing cover and tighten the bolts evenly to the specified torque.
10. Refill the cooling system with the appropriate coolant mixture recommended by Yamaha.
11. Reconnect the battery and start the engine, checking for leaks around the thermostat housing.
12. Allow the engine to reach operating temperature and verify that the cooling system functions properly.

Troubleshooting & FAQ

Q: How do I confirm this thermostat fits my Yamaha engine?
A: Cross-reference your engine model and year with the compatibility table above. You can also verify the OEM part number (60V-12411-00-00 or 68V-12411-00-00) on your existing thermostat or consult the Yamaha parts diagrams linked in the compatibility section.

Q: What are the signs that my thermostat needs replacement?
A: Common symptoms include engine overheating, failure to reach normal operating temperature, erratic temperature gauge readings, or visible corrosion and buildup on the thermostat. If your cooling system is malfunctioning, the thermostat is a frequent culprit.

Q: How often should I replace the thermostat on my outboard?
A: Yamaha recommends inspecting the thermostat during routine maintenance intervals (typically every 100 hours or annually). Replace it if you notice corrosion, mineral deposits, or if the engine exhibits temperature regulation issues.

Q: Can I install this thermostat myself, or do I need a professional?
A: If you have mechanical experience and the proper tools, installation is straightforward following the steps in this guide. However, professional installation is recommended to ensure correct torque settings, gasket sealing, and cooling system refill procedures.

Q: Is this an OEM part or an aftermarket replacement?
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.