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Outboard Motor Parts | OEM & Aftermarket
Shop OEM and aftermarket outboard motor parts for Mercury, Yamaha, Suzuki, Honda, Johnson / Evinrude / E-TEC, Tohatsu / Nissan, and Chrysler / Force engines. Pro Marine USA carries parts for routine maintenance, troubleshooting, repair, and complete marine engine rebuilds.
Browse by outboard manufacturer or engine system, or use our OEM parts lookup to identify the correct part number before ordering. Find cooling, fuel, ignition, electrical, internal engine, lower unit, steering, trim, service kit, gasket, seal, and rebuild parts in one place.
Shop Outboard Parts by Manufacturer
Chrysler / Force Outboard Parts for Chrysler and Force outboard repair 
Honda Outboard Honda cooling, fuel, electrical, and engine parts 
Johnson / Evinrude / E-TEC Outboard Johnson, Evinrude, E-TEC, and OMC replacement parts 
Mercury Outboard Mercury and Mariner maintenance, repair, and rebuild parts 
Suzuki Outboard Suzuki service, lower unit, fuel, and engine parts 
Tohatsu / Nissan Outboard Tohatsu and Nissan outboard replacement parts 
Yamaha Outboard Yamaha maintenance, repair, lower unit, and rebuild parts Find the Correct Outboard Part
Not sure which part fits your engine? Start with the engine manufacturer, horsepower, model number, serial number, and year whenever available.
Our OEM parts lookup lets you view factory parts diagrams and identify the original part number for many popular outboard engines. Once you have the OEM number, search Pro Marine to find available OEM and aftermarket replacement options.
Use Our OEM Parts Lookup »Shop Outboard Parts by Engine System
Outboard engines use several interconnected systems. Select your manufacturer above to browse the exact categories available for your engine, including the following common repair and maintenance areas.
Common Outboard Problems and Where to Start
- Engine overheating: inspect the water pump, impeller, thermostat, pressure-control components, cooling passages, and engine anodes.
- Hard starting or rough idle: check fuel delivery, carburetor or injector operation, spark plugs, ignition components, filters, and intake sealing.
- Weak spark or no spark: test ignition coils, stators, switch boxes or ignition modules, sensors, wiring, grounds, and related electrical components.
- Low compression or poor power: inspect pistons, rings, cylinder condition, head and powerhead gaskets, bearings, and other internal engine components.
- Milky gear lube: inspect prop shaft, driveshaft, shift shaft, bearing carrier, and other lower unit seals for water intrusion.
- Lower unit or gearcase noise: inspect bearings, gears, clutch components, shafts, and gear lube condition before continued operation.
- Trim or steering problems: inspect hydraulic fluid level, seals, hoses, trim motors, pumps, steering cylinders, and mechanical connections.
Why Buy Outboard Parts from Pro Marine USA?
- OEM and aftermarket replacement options for major outboard engine brands.
- Marine engine parts for routine maintenance, professional repair, and complete rebuild projects.
- OEM diagram and part-number lookup tools to help identify the correct component before ordering.
- Dealer pricing available for qualified marine repair businesses and dealers.
- Large selection of service kits, engine parts, lower unit components, fuel system parts, electrical parts, steering, and rigging products.
- Same-day weekday shipping available on qualifying in-stock orders placed before the shipping cutoff.
OEM and Aftermarket Outboard Parts
OEM parts are supplied by the original engine manufacturer and are designed for the specific engine application. Aftermarket parts are replacement components produced by independent marine parts manufacturers and may provide additional availability or value for many common repairs.
Pro Marine carries both genuine OEM parts and quality aftermarket replacement parts for many outboard maintenance, repair, and rebuild applications. Always confirm fitment using the engine model, serial number, horsepower, year range, or OEM part number when available.
Frequently Asked Questions
How do I find the correct parts for my outboard motor?
Start by identifying the engine manufacturer, horsepower, model number, serial number, and year. Select the manufacturer above to browse by engine system, or use the OEM parts lookup to locate the original part number from a factory diagram.
Can I search Pro Marine by OEM part number?
Yes. If you already have the OEM part number, enter it into the Pro Marine site search to locate available OEM and aftermarket replacement options. If you do not know the part number, use the OEM parts lookup first.
What information should I have before ordering an outboard part?
Have the engine manufacturer, horsepower, model number, serial number, and year whenever possible. An OEM part number from the original component or parts diagram is especially helpful because visually similar parts may fit different engine families.
What is the difference between OEM and aftermarket outboard parts?
OEM parts come from the original engine manufacturer. Aftermarket parts are replacement components manufactured by other marine parts companies for compatible applications. Pro Marine carries both OEM and aftermarket options across many common outboard engine systems.
Are aftermarket outboard motor parts reliable?
Quality aftermarket marine parts are commonly used for maintenance, professional repair, and engine rebuilding. The best option depends on the application, manufacturer, availability, and customer preference.
Do you carry parts for older outboard motors?
Yes. Pro Marine carries parts for many older Mercury, Mariner, Johnson, Evinrude, Chrysler, Force, Yamaha, Honda, Suzuki, Nissan, and Tohatsu outboards. Availability varies by engine family and component.
What outboard parts are commonly replaced during routine maintenance?
Common maintenance items include engine oil, oil filters, fuel filters, spark plugs, water pump impellers, complete water pump kits, thermostats, gear lube, drain plug seals, anodes, and manufacturer-specific service kit components.
Fitment Tip: Outboard parts can vary by model, serial range, horsepower, and production year. Confirm the OEM part number or engine identification information whenever possible before ordering.
8329521
83295210
83295211
83295212
14586
18-3549
9021-3
99021A16
99021A8
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
11919001
119196001
6E5-12411-00-00
6E5-12411-01-00
6E5-12411-02-00
4 Cylinder
100hp Looper
115hp Looper
125hp Looper
834821T
854513T
855746A2
47-84797M
689-44352-00-00
689-44352-01-00
689-44352-02-00
8M0175388
8M6010331
81604M
84797M
89890
0775466
18-3057
8M0024502
8M0027792
8M0204712
85089
850891
8508910
850892
8508920
850893
89640
