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SKU:
NLT1G01763
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Suzuki DF80-DF300 50°C Thermostat 17670-90J20
$31.99
In Stock
$31.99
Sale price
$31.99
Regular price
This new aftermarket 50°C / 122°F outboard thermostat replaces Suzuki 17670-90J20 and superseding 17670-90J21 for compatible DF80 through DF300 applications.
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Compatible Models
We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.
Compatible equipment / model
- Suzuki DF80, DF90, DF100 and DF100A applications using 17670-90J20
- Suzuki DF115, DF115A, DF140, DF140A
- Suzuki DF150, DF175
- Suzuki DF200, DF200A, DF225, DF250 and DF250A
- Suzuki DF300, DF300A and DF300AP applications using the listed reference
Product Overview
An outboard that runs too cool, takes too long to warm, or overheats after impeller and water-flow checks may have a thermostat stuck open or closed. Salt deposits, blocked passages, a weak water pump, sensor faults, and head-gasket problems can cause similar symptoms.
The 17670-90J20 family is commonly cataloged as a 50°C thermostat. It should not be confused with the separate 60°C / 140°F 17670-90J00 or 17670-90J01 family.
Match 17670-90J20 or 17670-90J21, opening temperature, engine model, year, thermostat location, gasket or seal, and serial range. Some engines use more than one thermostat or different temperatures.
Key Features & Performance
- Correct 50°C / 122°F reference family
- Corrosion-resistant marine thermostat construction
- Controls warm-up coolant flow when the original is stuck
- Cross-references the superseding Suzuki 90J21 number
Replaces Part Numbers
- 17670-90J20
- 17670-90J21
- 18-3525
- 8M0175320
- 8M6010295
- 8M6013864
- 881429
Common Uses
- Replacing a thermostat stuck open and running cold
- Repairing a confirmed stuck-closed overheat
- Servicing thermostats during cooling-system maintenance
Technical Specifications
- Product Type: Marine engine thermostat
- Opening Temperature: 50°C / 122°F
- Engine Family: Compatible Suzuki DF four-strokes
- Condition: New aftermarket replacement
Installation & Fitment
- Let the outboard cool and disconnect power
- Remove salt and debris around the housing
- Note thermostat direction and location
- Use a new seal or gasket where required
- Water-test at idle and under load while monitoring temperature
Compatibility Notice
Northline Parts does its best to list all known compatible models, but the correct part may fit an application that is not shown above. Model year, production date, serial number, engine or equipment specification, installed options, and previous repairs can change fitment. Match the original part, reference number, dimensions, connectors, mounting points, and product photos before purchase.
Frequently Asked Questions
Q: Is this a 60°C / 140°F thermostat? A: No. The researched 17670-90J20/90J21 family is 50°C / 122°F. The 90J00/90J01 family is commonly listed at 60°C.
Q: Will it fix every overheat? A: No. Intake blockage, impeller, water pump, passages, sensors, and engine damage also need diagnosis.
Q: Does a DF300 use more than one thermostat? A: Some outboards have multiple thermostat locations or revisions. Verify quantity and part number by engine serial.
Q: Is this an original-equipment part? A: No. This is a new aftermarket product. Brand names and part numbers are used only to identify compatible applications.
Part Summary
keywords: Suzuki 17670-90J20 thermostat, 17670-90J21 replacement, DF140 50C thermostat, DF300 cooling thermostat, Suzuki outboard runs cold repair
Brand names, model numbers, and reference part numbers are used for identification and compatibility purposes only. Verify the original component, specifications, and application before purchase.