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Suzuki DF100A-DF300AP 122°F Thermostat 17670-90J21
| Quantity | Price |
| 1 | 59.57 |
Genuine Suzuki OEM 122°F / 50°C Thermostat
Suzuki DF100A-DF300AP 122°F / 50°C Thermostat - 17670-90J21
The Suzuki 17670-90J21 Thermostat is a genuine Suzuki OEM 122°F / 50°C engine thermostat used across a broad range of Suzuki four-stroke outboards.
Verified applications include select DF100A, DF115A, DF140A, DF150, DF175, DF200A, DF250A and DF300A / DF300AP engine families, including many AP, AT, AZ, AST and later model configurations.
This thermostat supersedes / cross references Suzuki 17670-90J20 and is also part of the same thermostat family used in select Yamaha and Mercury applications.
OEM & Cross Reference Numbers
| Brand / Type | Part Number |
|---|---|
| Suzuki OEM | 17670-90J21 |
| Suzuki OEM / Previous | 17670-90J20 |
| Yamaha OEM | 60V-12411-00-00 |
| Yamaha OEM | 68V-12411-00-00 |
| Sierra | 18-3525 |
| Mercury OEM | 8M0175320 |
| Mercury OEM | 8M6010295 |
| Mercury OEM | 8M6013864 |
| Mercury OEM | 881429 |
| Pro Marine Reference | F12411 |
Suzuki Fitment
DF100A, DF115A, DF140A, DF150, DF175, DF200A, DF250A and DF300A / DF300AP four-stroke outboards.
| Suzuki Engine Family | Verified Application Coverage |
|---|---|
| DF100A | Select DF100A and DF100AT applications beginning with the 2013 model family and later serial configurations, including 10003F-series engines. |
| DF115A | Select DF115A, DF115AT, DF115AST, DF115AZ and related applications beginning with the 2013 model family and later serial ranges. |
| DF140A | Select DF140A, DF140AT and DF140AZ applications beginning with the 2013 model family and later serial configurations. |
| DF150 | Select DF150, DF150AP, DF150AS, DF150AST, DF150AT and DF150AZ applications, including later 2020-2026 model / serial families. |
| DF175 | Select DF175, DF175AP, DF175AT and DF175AZ applications, including later 2020-2026 model / serial families. |
| DF200A | Select DF200A, DF200AP, DF200AST, DF200AT and DF200AZ applications, including 2015 and later model / serial families. |
| DF250A | Select DF250A, DF250AP and DF250ATSS applications, including 2013, 2015 and later model families. |
| DF300A / DF300AP | Select DF300A and DF300AP applications, including 2013, 2015 and later serial families. |
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
Suzuki can use different thermostats within similar horsepower families. Verify the complete engine model / serial number and confirm that your original thermostat calls for 17670-90J20 or 17670-90J21 before ordering.
This thermostat has an opening temperature of approximately 122°F / 50°C.
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.
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.
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.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Parts must be new, unused, and in original packaging.
- Installed parts are not returnable.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
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