Thermostat (71°C/160°F) – Fits Suzuki Outboard DF90-DF300 (Replaces 17670-90J10)

Thermostat (71°C/160°F) – Fits Suzuki Outboard DF90-DF300 (Replaces 17670-90J10)

This thermostat is designed for Suzuki 4-Stroke outboard motors from 90 to 300 HP, manufactured between 2001 and 2016. It fits a wide range of models, including the DF90, DF100, DF115, DF140, DF150, DF175, DF200, DF225, DF250, and DF300 series engines.

It serves as a direct replacement for Suzuki part numbers 17670-90J10 and 17670-90J10-000, as well as OMC/Johnson/Evinrude part number 5033722.

• Regulates engine temperature by opening at 71°C (160°F).
• Direct replacement for a straightforward installation.
• Package includes one thermostat and gasket.

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 Suzuki owners, You can review exploded diagrams here to verify part numbers: Suzuki Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 x Thermostat (17670-90J10)

Installation Guide

1. Ensure the engine is completely cool before starting work.
2. Locate the thermostat housing. Refer to your service manual for the exact location.
3. Place a drain pan under the housing to catch any spilling coolant.
4. Unscrew the bolts holding the housing cover in place.
5. Carefully remove the cover, the old thermostat, and the gasket. Note the orientation of the old parts.
6. Thoroughly clean the mating surfaces of the housing and cover, removing all old gasket material.
7. Install the new thermostat in the correct orientation as noted previously.
8. Place the new gasket into position and re-install the housing cover.
9. Tighten the bolts to the manufacturer-specified torque, typically in a crisscross pattern.
10. Refill the cooling system with the correct type and amount of coolant.
11. Start the engine and carefully check for any leaks around the housing.
12. Let the engine run until it reaches normal operating temperature to ensure the thermostat opens correctly. Top off coolant if needed.

Troubleshooting & FAQ

Q: How do I confirm this thermostat fits my Suzuki outboard?

A: Check your engine's model and year against the "Compatible Engine Models" table. It is crucial to also verify that your existing part number matches one of the numbers listed in the "Part Number Cross-Reference" section, such as 17670-90J10.

Q: What are the symptoms of a failing thermostat?

A: A faulty thermostat can cause the engine to either overheat (if it's stuck closed) or run too cool (if it's stuck open). Overheating can lead to serious engine damage, while running too cool reduces fuel efficiency and performance.

Q: How often should the thermostat be replaced?

A: There is no fixed replacement interval, but it is good practice to inspect the thermostat during regular cooling system service. We recommend replacing it every few years as preventative maintenance, particularly for engines operated 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.