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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
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
17670-90J21
17670-93960
17670-93961
17670-93962
17670-93963
17670-93964
17670-94300
17670-94301
17670-95290
17670-95291
17670-95292
17670-95293
5030742
5031175
769469
17670-94501
17670-94502
17670-94503
17670-94510
17670-95300
17670-95301
17670-95302
17670-95303
17670-95500
17670-95501
17685-87D00-H17
17685-87D10
18-0797
5031430
17670-90J11
5033722
769768
5030745
17670-90J11
5033722
769768
17670-94400
17670-94401
17670-94402
17670-94403
17670-94404
5031758
769184
17670-94400
17670-94401
17670-94402
17670-94403
17670-94404
5031758
769184
17670-90J00
17670-90J01
5033721
300hp
325hp
350hp
18-3636
6DA-12411-00-00
6DA-12411-01-00
8M0175324
8M6010299
Yamaha OEM 122°F / 50°C Thermostat
Yamaha, Suzuki & Mercury 122°F / 50°C Thermostat - F12411-1
The F12411-1 Thermostat is a genuine Yamaha OEM 122°F / 50°C engine thermostat used across a surprisingly broad range of Yamaha, Suzuki and Mercury outboard applications.
Yamaha applications include select F115 four-strokes plus 200-300HP HPDI families including VZ200, VZ225, VZ250, VZ300, Z250, Z300, LZ250 and LZ300. Suzuki applications include select DF100A through DF300AP four-stroke engines. Mercury applications include select 115HP EFI outboards.
This thermostat cross references Yamaha 60V-12411-00-00 and 68V-12411-00-00, Suzuki 17670-90J20 / 17670-90J21, Sierra 18-3525, and several Mercury numbers listed below.
OEM & Cross Reference Numbers
| Brand / Type | Part Number |
|---|---|
| Pro Marine Reference | F12411 |
| Yamaha OEM | 60V-12411-00-00 |
| Yamaha OEM | 68V-12411-00-00 |
| Suzuki OEM | 17670-90J20 |
| Suzuki OEM | 17670-90J21 |
| Sierra | 18-3525 |
| Mercury OEM | 8M0175320 |
| Mercury OEM | 8M6010295 |
| Mercury OEM | 8M6013864 |
| Mercury OEM | 881429 |
Yamaha Fitment
F115 / LF115 four-stroke, VZ200, VZ225, VZ250, VZ300 HPDI, Z250 / Z300 HPDI and LZ250 / LZ300 counter-rotation HPDI applications.
| Engine Family | Verified Years / Models |
|---|---|
| Yamaha F115 Four-Stroke | 2000-Present fitment represented by F115TLRY, F115TLRZ, F115TJRA/B/C/D, F115TLRA/B/C/D, F115TXRA/B/C/D and later F115JA, F115LA, F115TJR, F115TLR, F115TXR and F115XA model families. |
| Yamaha LF115 Counter-Rotation Four-Stroke | 2000-Present fitment represented by LF115TXRY, LF115TXRZ, LF115TXRA/B/C/D, LF115TXR, LF115XA and related model families. |
| Yamaha VZ200 HPDI | Select 2005-Present VZ200TLR / VZ200RTLR applications. |
| Yamaha VZ225 HPDI | Select 2003-Present VZ225TLR and VZ225HTLR applications. |
| Yamaha VZ250 HPDI | Select 2003-Present VZ250TLR and VZ250FTLR applications. |
| Yamaha VZ300 HPDI | Select 2004-Present VZ300TLR and VZ300BTLR applications. |
| Yamaha Z250 HPDI | Select 2003-Present Z250TUR and Z250TXR applications. |
| Yamaha Z300 HPDI | Select 2004-Present Z300TUR and Z300TXR applications. |
| Yamaha LZ250 / LZ300 HPDI | Select 2003-Present counter-rotation LZ250 and LZ300 TUR / TXR applications. |
Suzuki Four-Stroke Fitment
Suzuki uses this 50°C / 122°F thermostat across numerous inline-four and larger four-stroke engine families. The supplied fitment includes the following major groups:
| Suzuki Engine Family | Verified Application Coverage |
|---|---|
| DF100A | Select DF100A / DF100AT applications from 2013 and later, including 10003F and related serial families. |
| DF115A | Select DF115A, DF115AT, DF115AST, DF115AZ and related variants from 2013 and later. |
| DF140A | Select DF140A, DF140AT and DF140AZ applications from 2013 and later. |
| DF150 / DF150AP | Select DF150, DF150AP, DF150AS, DF150AST, DF150AT and DF150AZ applications including multiple 2020-2026 model / serial families. |
| DF175 / DF175AP | Select DF175, DF175AP, DF175AT and DF175AZ applications including multiple 2020-2026 model / serial families. |
| DF200A / DF200AP | Select DF200A, DF200AP, DF200AST, DF200AT and DF200AZ applications, including 2015 and later model families. |
| DF250A / DF250AP | Select DF250A, DF250AP and DF250ATSS applications including 2013, 2015 and later serial families. |
| DF300A / DF300AP | Select DF300A and DF300AP applications including 2013, 2015 and later model / serial families. |
Mercury 115HP EFI Fitment
| Engine | Serial Range |
|---|---|
| Mercury 115HP EFI | 0T178500 thru 0T800999 |
| Mercury 115HP EFI | 0T801000 thru 1B226999 |
| Mercury 115HP EFI | 1B227000 thru 1B366822 |
Thermostats can vary within the same horsepower range and engine family. Match the engine model / serial number and confirm that the original thermostat cross references one of the OEM numbers listed above.
This thermostat has an opening temperature of approximately 122°F / 50°C.
Choose Your Thermostat
Pro Marine stocks this thermostat in multiple versions, allowing you to choose between the Yamaha OEM thermostat, the Pro Marine aftermarket version or the Suzuki OEM version.
Pro Marine F12411 122°F / 50°C Thermostat
Pro Marine aftermarket version of this 122°F / 50°C thermostat. A cost-effective replacement for compatible Yamaha, Suzuki and Mercury applications using the OEM cross references listed above.
Suzuki OEM 17670-90J21 50°C / 122°F Thermostat
Genuine Suzuki OEM version for compatible DF100A through DF300-series applications that call for Suzuki thermostat 17670-90J20 or 17670-90J21.
What This Thermostat Does
The thermostat regulates coolant flow through the engine so the powerhead can reach and maintain its intended operating temperature. When the engine is cold, the thermostat restricts cooling-water flow. As temperature rises to approximately 122°F / 50°C, the thermostat begins opening to allow additional cooling water to circulate.
Correct thermostat operation is important for engine warm-up, combustion quality, fuel management and overall cooling-system performance.
Common Signs of a Thermostat Problem
- Engine running hotter than normal
- Overheat warning or alarm
- Thermostat stuck closed and restricting cooling water
- Engine running unusually cool because the thermostat is stuck open
- Excessive deposits or corrosion around the thermostat
- Damaged thermostat spring or valve
- Thermostat fails temperature / opening test
Why Replace an Outboard Thermostat?
Marine thermostats operate continuously in raw-water cooling systems and can become affected by salt, minerals, corrosion, debris and age. A thermostat that sticks closed can restrict cooling flow, while one that remains open can prevent the engine from reaching its intended operating temperature.
Thermostats should be inspected during cooling-system service and replaced when damaged, corroded, sticking or outside the manufacturer's temperature specification.
Key Features and Benefits
- Genuine Yamaha OEM thermostat
- 122°F / 50°C temperature rating
- Fits select Yamaha F115 and LF115 four-stroke outboards
- Fits select Yamaha VZ200-VZ300 HPDI engines
- Fits select Yamaha Z250 / Z300 and LZ250 / LZ300 HPDI engines
- Fits select Suzuki DF100A-DF300AP applications
- Fits select Mercury 115HP EFI serial ranges
- Cross references Yamaha 60V-12411-00-00 and 68V-12411-00-00
- Cross references Suzuki 17670-90J20 and 17670-90J21
- Cross references Sierra 18-3525
- Cross references Mercury 8M0175320, 8M6010295, 8M6013864 and 881429
- Pro Marine aftermarket and Suzuki OEM alternatives linked above
FAQ
What temperature is this thermostat?
This thermostat is rated at approximately 122°F / 50°C.
Is F12411-1 a genuine Yamaha thermostat?
Yes. This listing is for the Yamaha OEM version.
A Pro Marine aftermarket version is linked above.
Does this fit Yamaha F115?
Yes. The supplied fitment includes numerous Yamaha F115 and LF115
four-stroke models from 2000 through later applications. Verify your
complete model number before ordering.
Does this fit Yamaha HPDI engines?
Yes. Verified fitment includes select VZ200, VZ225, VZ250, VZ300,
Z250, Z300, LZ250 and LZ300 HPDI models.
Does this fit Suzuki DF100A through DF200A?
Yes. The supplied fitment includes extensive DF100A, DF115A, DF140A,
DF150, DF175 and DF200A / AP applications.
Does this fit Suzuki DF250 and DF300?
Yes. Select DF250A / AP and DF300A / AP applications are included in
the fitment supplied above.
Does this fit Mercury 115 EFI?
Yes. Verified Mercury fitment includes 115HP EFI serial ranges
0T178500 thru 0T800999,
0T801000 thru 1B226999, and
1B227000 thru 1B366822.
What Yamaha OEM numbers does it replace?
Yamaha references include 60V-12411-00-00 and
68V-12411-00-00.
What Suzuki thermostat does this cross reference?
It cross references Suzuki 17670-90J20 and
17670-90J21.
Do you stock an aftermarket version?
Yes. The Pro Marine F12411 122°F / 50°C thermostat is
linked above.
Do you stock the genuine Suzuki version?
Yes. The genuine Suzuki 17670-90J21 thermostat is also
linked above.
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
F12411-1, F12411, Yamaha thermostat, Yamaha 122 degree thermostat, Yamaha 50C thermostat, 60V-12411-00-00, Yamaha 60V-12411-00-00, 68V-12411-00-00, Yamaha 68V-12411-00-00, Suzuki thermostat, 17670-90J20, 17670-90J21, Suzuki 17670-90J21, 18-3525, Sierra 18-3525, 8M0175320, 8M6010295, 8M6013864, 881429, Mercury 115 EFI thermostat, Yamaha F115 thermostat, Yamaha LF115 thermostat, Yamaha VZ200 thermostat, Yamaha VZ225 thermostat, Yamaha VZ250 thermostat, Yamaha VZ300 thermostat, Yamaha Z250 thermostat, Yamaha Z300 thermostat, Yamaha LZ250 thermostat, Yamaha LZ300 thermostat, Suzuki DF100A thermostat, Suzuki DF115A thermostat, Suzuki DF140A thermostat, Suzuki DF150 thermostat, Suzuki DF175 thermostat, Suzuki DF200A thermostat, Suzuki DF250 thermostat, Suzuki DF300 thermostat, Suzuki DF300AP thermostat
17670-90J20
17670-90J21
18-3525
60V-12411-00-00
68V-12411-00-00
8M0175320
8M6010295
8M6013864
881429