Outboard Thermostat for Honda BF 75-225 HP Outboard Motors 19300-ZY3-023

Honda Outboard Thermostat – Fits Honda Marine BF 75-225 HP (Replaces 19300-ZY3-023)

This thermostat is designed for Honda Marine 4-Stroke outboard motors, specifically models from 75 HP to 225 HP (BF75–BF225) manufactured from 2002 to the present. It ensures your engine maintains the correct operating temperature for optimal performance and longevity.

It serves as a direct replacement for Honda OEM part numbers 19300-ZY3-023 and 19300-ZY6-003. Please verify compatibility with your specific engine model using the tables below.

• Engineered for direct, hassle-free installation.
• Maintains a consistent operating temperature of 60°C (140°F).
• Constructed from high-quality stainless steel and copper for corrosion resistance.

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.

Technical Specifications

Package Contents

• 1 x Thermostat Assembly (19300-ZY3-023)

Installation Guide

1. Engine Cool Down: Ensure the engine is completely cool before starting.
2. Locate Housing: Find the thermostat housing on the engine block.
3. Drain Coolant: Drain enough coolant to prevent spills when the housing is opened.
4. Remove Cover: Unscrew the bolts that secure the thermostat housing cover.
5. Extract Old Thermostat: Carefully lift the cover to remove the old thermostat and its gasket.
6. Clean Surfaces: Thoroughly clean the mating surfaces of the housing and cover, removing all residue.
7. Install New Thermostat: Place the new thermostat into the housing, ensuring correct orientation.
8. Position Gasket: Fit the new gasket onto the housing.
9. Secure Cover: Reinstall the housing cover and tighten the bolts to the manufacturer-specified torque.
10. Refill Coolant: Top off the cooling system with the appropriate coolant.
11. Check for Leaks: Start the engine and carefully inspect the housing for any leaks.
12. Verify Operation: Let the engine reach its normal operating temperature to confirm the new thermostat opens correctly.

Troubleshooting & FAQ

Q: How do I confirm this fits my engine?

A: This thermostat fits a wide range of Honda Marine 4-stroke outboards from 75 HP to 225 HP (2002-present). To guarantee fitment, please review the detailed compatible models list on this page and cross-reference your engine's original part number with 19300-ZY3-023 or 19300-ZY6-003.

Q: What are the common signs of a failing thermostat?

A: Key symptoms include the engine overheating, running too cool and failing to reach proper operating temperature, or erratic temperature gauge readings. A thermostat stuck in either the open or closed position is a common cause.

Q: How often should I replace my outboard's thermostat?

A: For preventative maintenance, it is recommended to inspect the thermostat during routine cooling system service and consider replacement every 2-3 years, especially if the engine is used frequently in saltwater environments.

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.