Honda BF75-BF150 Outboard Thermostat 50C 19300-ZY6-003
6E5-12411-30b
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Honda BF75–BF150 50°C Thermostat
Aftermarket replacement | Honda reference 19300-ZY6-003
A 50°C / 122°F aftermarket thermostat for selected Honda four-stroke outboards in the BF75 to BF150 families. It replaces Honda reference 19300-ZY6-003 in the thermostat position shown by the applicable engine parts diagram.
Key Features
- Correct identification: Aftermarket replacement, not Honda-branded.
- 50°C calibration: Rated at 122°F / 50°C.
- Model-specific application: Catalogued for selected BF75D through BF150A engines.
- Direct service replacement: For cooling systems specifying 19300-ZY6-003.
- Preventive maintenance: Replaces a corroded, sticking or out-of-spec thermostat.
Technical Specs
| Part type | Outboard cooling-system thermostat |
| Opening temperature | 50°C / 122°F |
| Supply type | Aftermarket replacement |
| Honda reference | 19300-ZY6-003 |
| Quantity | 1 thermostat |
| 4Boats SKU | 6E5-12411-30b |
Compatibility / Fitment Guide
Model families catalogued for Honda 19300-ZY6-003:
| Honda model family | Known variants | Required check |
|---|---|---|
| BF75D / BF80A / BF90D / BF100A | Selected D, A and K-series suffixes | Confirm 19300-ZY6-003 in the cylinder-head or thermostat parts diagram for the serial range. |
| BF115D | Including selected BF115D and BF115DK1 variants | Check the required thermostat position; do not assume all BF115 generations are identical. |
| BF135A / BF150A | Selected A/K-series variants | Verify full model suffix and frame/serial number. |
Exclusions: Not a universal Honda thermostat and not a substitute for 60°C reference 19300-ZW9-003 or 72°C references unless Honda lists a serial-specific supersession.
Part Number Cross Reference
| Honda OEM reference | 19300-ZY6-003 |
| Compact format | 19300ZY6003 |
| Aftermarket catalogue reference | 7634371 |
| 4Boats SKU | 6E5-12411-30b |
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 part?
No. It is an aftermarket replacement for Honda reference 19300-ZY6-003.
Does it fit every Honda 75–150HP outboard?
No. Fitment is limited to model and serial variants whose parts diagram specifies 19300-ZY6-003.
Is this the 50°C thermostat?
Yes. It is listed at 50°C / 122°F.
Why must I check the serial number?
Honda can change thermostat references between generations, suffixes and thermostat positions even when horsepower is the same.
Use the workshop manual for installation and tightening instructions. Replace associated seals only as specified for the exact engine; seals are not stated as included unless visible in the listing contents.
For the products under £150 the shipping is £6.99.
Free delivery for most items over £150.
