Honda Outboard Thermostat Kit 60C 19300-ZW9-003 Sierra 18-3628-1
19300-ZW9-003g
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Honda 60°C Outboard Thermostat Kit
Aftermarket replacement | Honda reference 19300-ZW9-003
An aftermarket cooling-system thermostat kit for Honda four-stroke outboards that specify a 60°C / 140°F thermostat under reference 19300-ZW9-003. It replaces the service item that controls coolant flow as the engine warms and is intended for preventive maintenance or replacement of a sticking thermostat.
Key Features
- 60°C calibration: Rated at 140°F / 60°C.
- Direct replacement format: Intended for Honda applications calling for 19300-ZW9-003.
- Aftermarket supply: Not a Honda-branded component.
- Cooling-system service: Suitable for planned thermostat inspection or replacement.
- Five product images: Current listing meets the minimum image requirement.
Technical Specs
| Part type | Outboard cooling-system thermostat kit |
| Opening temperature | 60°C / 140°F |
| Supply type | Aftermarket replacement |
| Primary Honda reference | 19300-ZW9-003 |
| Sierra reference | 18-3628-1 |
| 4Boats SKU | 19300-ZW9-003g |
Compatibility / Fitment Guide
Confirmed application basis: Honda four-stroke outboards whose serial-specific parts diagram specifies thermostat 19300-ZW9-003 and a 60°C rating.
| Honda family | Models commonly catalogued with this reference | Verification |
|---|---|---|
| Portable / mid-range BF and BFP | BF8D, BFP8D, BF9.9D, BFP9.9D, BF15D, BFP15D, BF20D, BFP20D, BF25D and BF30D | Check full model suffix and serial range. |
| BF40 / BF50 / BF60 families | Selected BF40A/D, BF50A/D, BF60A and BFP60A applications | Use only where 19300-ZW9-003 appears in the cooling-system diagram. |
| Other Honda BF engines | Some larger engines also use this reference in a specific thermostat position. | Do not order by horsepower alone; verify thermostat position and serial-specific part number. |
Not interchangeable by temperature alone: Do not substitute for a 50°C or 72°C Honda thermostat unless the official supersession for the exact engine explicitly calls for this part.
Part Number Cross Reference
| Honda | 19300-ZW9-003 |
| Sierra | 18-3628-1 |
| Earlier references used in some catalogues | 19300-921-003; 19300-881-741 |
| 4Boats / supplier SKU | 19300-ZW9-003g |
Cross-reference numbers identify the intended application; they do not make this an original Honda part. Confirm the number shown in the parts diagram for your exact engine serial range.
Frequently Asked Questions
Is this a genuine Honda thermostat?
No. This listing is for an aftermarket replacement referenced against Honda 19300-ZW9-003.
Will it fit every Honda 8–225HP outboard?
No. Honda uses different thermostat ratings and part numbers across engine families and serial ranges. Match 19300-ZW9-003 in the parts diagram.
Is the opening temperature 60°C?
Yes. The listed rating is 60°C / 140°F.
Should the seal be replaced during installation?
Inspect all sealing parts removed during service and replace them where the Honda service procedure specifies. Confirm the supplied contents from the listing images before starting work.
Installation should be carried out with the engine cool and in accordance with the Honda workshop procedure. Confirm model, full suffix and serial number before purchase.
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