Cooling System | Suzuki Outboard

OEM & Cross Reference Numbers

Suzuki Fitment

Detailed Suzuki Model Coverage

• DF100A and DF100AT
• DF115A, DF115AT, DF115AST and DF115AZ
• DF140A, DF140AT and DF140AZ
• DF150, DF150AP, DF150AS, DF150AST, DF150AT and DF150AZ
• DF175, DF175AP, DF175AT and DF175AZ
• DF200A, DF200AP, DF200AST, DF200AT and DF200AZ
• DF250A, DF250AP and DF250ATSS
• DF300A and DF300AP
• Multiple later 2020-2026 AP / AT / AZ serial families where listed

Alternate Thermostat Options

Pro Marine also stocks this thermostat family in a Pro Marine aftermarket version and a genuine Yamaha OEM version.

Pro Marine F12411 122°F / 50°C Thermostat

Pro Marine aftermarket version for compatible Suzuki, Yamaha and Mercury applications that use this thermostat family.

View Pro Marine F12411 Thermostat

Yamaha OEM F12411-1 122°F / 50°C Thermostat

Genuine Yamaha OEM version of the same thermostat family for compatible Yamaha applications using 60V-12411-00-00 or 68V-12411-00-00.

View Yamaha OEM Thermostat

What This Thermostat Does

The thermostat controls cooling-water flow through the engine so the powerhead reaches and maintains the proper operating temperature.

When the engine is cold, the thermostat restricts cooling-water flow. As engine temperature rises to approximately 122°F / 50°C, the thermostat begins opening to allow additional cooling water to circulate.

Proper thermostat operation supports engine warm-up, fuel management, combustion efficiency and consistent cooling-system performance.

Common Signs of Thermostat Problems

• Engine running hotter than normal
• Overheat warning or alarm
• Thermostat stuck closed and restricting cooling flow
• Engine running too cool because the thermostat is stuck open
• Salt, mineral or corrosion buildup around the thermostat
• Damaged thermostat spring or valve
• Thermostat fails a temperature / opening test

Why Replace a Suzuki Outboard Thermostat?

Outboard thermostats operate in raw-water cooling systems and can be exposed to salt, mineral deposits, corrosion and debris. Over time, deposits or mechanical wear can prevent the thermostat from opening and closing properly.

A thermostat stuck closed can contribute to overheating, while a thermostat that remains open may prevent the engine from reaching its intended operating temperature. Inspect thermostats during routine cooling-system service and replace them when damaged, corroded or outside specification.

Key Features and Benefits

• Genuine Suzuki OEM thermostat
• Suzuki part number 17670-90J21
• Supersedes / cross references 17670-90J20
• 122°F / 50°C opening temperature
• Fits select Suzuki DF100A applications
• Fits select Suzuki DF115A applications
• Fits select Suzuki DF140A applications
• Fits select Suzuki DF150 and DF175 applications
• Fits select Suzuki DF200A applications
• Fits select Suzuki DF250A applications
• Fits select Suzuki DF300A / DF300AP applications
• Pro Marine aftermarket option linked above
• Yamaha OEM option linked above

FAQ

What temperature is Suzuki thermostat 17670-90J21?
It is rated at approximately 122°F / 50°C.

Is 17670-90J21 a genuine Suzuki part?
Yes. This listing is for the genuine Suzuki OEM thermostat.

Does 17670-90J21 replace 17670-90J20?
Yes. Both numbers are part of the cross-reference family for this 50°C / 122°F thermostat.

Does this fit Suzuki DF100A, DF115A and DF140A?
Yes. The supplied fitment includes extensive applications across all three engine families. Verify the exact model and serial number before ordering.

Does it fit Suzuki DF150 and DF175?
Yes. Multiple standard, AP, AT and AZ variants are included in the supplied application data.

Does it fit Suzuki DF200A?
Yes. Verified applications include DF200A, DF200AP, DF200AST, DF200AT and DF200AZ configurations.

Does it fit Suzuki DF250 and DF300?
Yes. Select DF250A / AP / ATSS and DF300A / AP applications are included.

Do you stock an aftermarket version?
Yes. The Pro Marine F12411 thermostat is linked above.

Do you stock the Yamaha OEM version?
Yes. The Yamaha OEM F12411-1 thermostat is also linked above.

How should I confirm fitment?
Verify your Suzuki engine model and serial number and confirm that the thermostat specified for the engine is 17670-90J20 or 17670-90J21.

Searchable Terms

17670-90J21, Suzuki 17670-90J21, 17670-90J20, Suzuki 17670-90J20, Suzuki thermostat, Suzuki 122 degree thermostat, Suzuki 50C thermostat, DF100A thermostat, DF115A thermostat, DF140A thermostat, DF150 thermostat, DF150AP thermostat, DF175 thermostat, DF175AP thermostat, DF200A thermostat, DF200AP thermostat, DF250A thermostat, DF250AP thermostat, DF300A thermostat, DF300AP thermostat, F12411, F12411-1, 60V-12411-00-00, 68V-12411-00-00, 18-3525, 8M0175320, 8M6010295, 8M6013864, 881429, Suzuki outboard thermostat, Suzuki cooling system thermostat

OEM and Cross Reference Numbers

What This Part is Used For

Suzuki 17913-93J00 is a water plug used in the cooling-water system on many Suzuki DF outboards.

Depending on the engine family, Suzuki parts diagrams may show the water plug in different cooling-system locations. It provides a removable closure at the applicable water passage or service point.

Replace the plug if the original is missing, damaged, cracked, or no longer seals properly.

Compatible Suzuki Outboard Applications

The supplied Suzuki application data shows 17913-93J00 used across numerous DF four-stroke outboards, including the following major engine families:

Model and Serial Number Fitment

Suzuki fitment is frequently determined by the complete model designation and engine serial number rather than horsepower alone. For example, the supplied application information includes specific DF100, DF115 and DF140 variants with individual serial ranges. :contentReference[oaicite:0]{index=0}

Later-model applications also include numerous DF300, DF325 and DF350 variants with model-specific serial numbers. :contentReference[oaicite:1]{index=1}

Water Plug Installation Tips

• Allow the engine to cool before working around cooling-system components.
• Inspect the original plug and surrounding sealing surface before installation.
• Remove dirt, salt buildup, corrosion, or debris from the sealing area.
• Start the replacement plug carefully to avoid damaging the threads.
• Inspect any associated sealing component during replacement.
• Follow the Suzuki service procedure for your specific engine when tightening the plug.
• After installation, inspect the area for leakage during normal engine operation.

When Should the Water Plug Be Replaced?

Consider replacing the water plug when the original plug is:

• Missing
• Cracked or physically damaged
• Showing damaged threads
• Leaking around the sealing area
• Damaged during removal or service

Key Features and Benefits

• Genuine Suzuki Marine OEM component
• Manufacturer item number 17913-93J00
• Used in the cooling-water system on select Suzuki DF outboards
• Fits applications ranging from small portable through high-horsepower Suzuki engines
• Direct OEM replacement where Suzuki specifies 17913-93J00
• Extensive Suzuki DF model coverage

FAQ

What is Suzuki part number 17913-93J00?
17913-93J00 is a genuine Suzuki Marine water plug used on select Suzuki DF four-stroke outboards.

Is 17913-93J00 a genuine Suzuki part?
Yes. This listing is for the genuine Suzuki OEM water plug.

Does 17913-93J00 fit Suzuki DF150 and DF175 outboards?
The supplied application data includes numerous DF150 and DF175 models, including standard, AP, AT, AZ and other configurations. Exact fitment depends on model and serial number.

Does this water plug fit Suzuki DF200, DF225 and DF250 engines?
Yes, the supplied application data includes numerous versions of the DF200, DF225 and DF250 families. Verify your exact model and serial number before ordering.

Does 17913-93J00 fit Suzuki DF300, DF325 and DF350 engines?
The supplied fitment data includes select DF300, DF325A and DF350A/DF350AMD applications. Exact model and serial verification is required.

Does this part fit smaller Suzuki outboards?
Yes. Applications supplied for this part also include select DF8A, DF9.9, DF15A, DF20A, DF25A and DF30A outboards.

Can I determine fitment by horsepower?
Not reliably. Suzuki may use different components between models and serial ranges of the same horsepower. Always verify the complete model and serial number.

Searchable Part Numbers

17913-93J00, 1791393J00

Searchable Terms

Suzuki water plug, Suzuki outboard water plug, Suzuki flush plug, Suzuki water flush plug, Suzuki cooling water plug, Suzuki DF water plug, DF150 water plug, DF175 water plug, DF200 water plug, DF250 water plug, DF300 water plug, DF350 water plug, genuine Suzuki outboard parts