Thermostat 72°C/162°F – Fits Honda Outboard Motors 20-130 HP (Replaces 19300-ZV5-043, 19300-ZV5-023, 19300-ZV5-013)
Thermostat 72°C/162°F – Fits Honda Outboard Motors 20-130 HP (Replaces 19300-ZV5-043, 19300-ZV5-023, 19300-ZV5-013) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Thermostat 72°C/162°F – Fits Honda Outboard Motors 20-130 HP (Repla...
Thermostat 72°C/162°F – Fits Honda Outboard Motors 20-130 HP (Replaces 19300-ZV5-043, 19300-ZV5-023, 19300-ZV5-013) is backordered and will ship as soon as it is back in stock.
Product Details
This replacement Thermostat 72°C/162°F – Fits Honda Outboard Motors 20-130 HP is engineered to regulate engine temperature for optimal performance and longevity. It is designed for a wide range of Honda 4-stroke outboard models produced from 1999–2003, including the BF20, BF25, BF30, BF35, BF40, BF45, BF50, BF75, BF90, BF115, and BF130 series engines.
This component serves as a direct replacement for Honda part numbers 19300-ZV5-043, 19300-ZV5-023, 19300-ZV5-013, 19300-ZV5-003, 19300-ZV5-033, and Sierra 18-3630, ensuring a precise fit and function.
- Engineered for direct OEM replacement installation.
- Regulates engine temperature by opening at 72°C/162°F.
- Constructed from durable metal for reliable operation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Honda | 19300-ZV5-043 |
| Honda | 19300-ZV5-023 |
| Honda | 19300-ZV5-013 |
| Honda | 19300-ZV5-003 |
| Honda | 19300-ZV5-033 |
| Sierra | 18-3630 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This thermostat is designed for a range of Honda 4-stroke outboard motors produced between 1999 and 2003.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Honda | BF20A, BF20A2, BF20A3, BF20AX | 20 | 4-Stroke | 1999–2003 | 19300-ZV5-043 | |
| Honda | BF25A, BF25A1, BF25A2, BF25A3, BF25AW, BF25AX, BF25AY | 25 | 4-Stroke | 1999–2003 | 19300-ZV5-043 | |
| Honda | BF30A, BF30A1, BF30A2, BF30A3, BF30AW, BF30AX, BF30AY | 30 | 4-Stroke | 1999–2003 | 19300-ZV5-043 | |
| Honda | BF35AM | 35 | 4-Stroke | 1999–2003 | 19300-ZV5-043 | |
| Honda | BF40A, BF40A1, BF40A2, BF40A3, BF40AW, BF40AX, BF40AY, BF40B, BF40B2, BF40BX | 40 | 4-Stroke | 1999–2003 | 19300-ZV5-043 | |
| Honda | BF45AM | 45 | 4-Stroke | 1999–2003 | 19300-ZV5-043 | |
| Honda | BF50A, BF50A1, BF50A2, BF50A3, BF50AW, BF50AX, BF50AY | 50 | 4-Stroke | 1999–2003 | 19300-ZV5-043 | |
| Honda | BF75A1, BF75A2, BF75A3, BF75A4, BF75A5, BF75A6, BF75AT, BF75AV, BF75AW, BF75AX, BF75AY | 75 | 4-Stroke | 1999–2003 | 19300-ZV5-043 | |
| Honda | BF90A1, BF90A2, BF90A3, BF90A4, BF90A5, BF90A6, BF90AT, BF90AV, BF90AW, BF90AX, BF90AY | 90 | 4-Stroke | 1999–2003 | 19300-ZV5-043 | |
| Honda | BF115A1, BF115A2, BF115AX, BF115AY | 115 | 4-Stroke | 1999–2003 | 19300-ZV5-043 | |
| Honda | BF130A1, BF130A2, BF130AX, BF130AY | 130 | 4-Stroke | 1999–2003 | 19300-ZV5-043 |
Technical Specs
- Product Type
- Thermostat
- Installation
- Direct OEM replacement
- Operating Temperature
- 72°C/162°F (opening temperature)
- Housing Material
- Metal
- Housing Color
- Silver/metallic
What’s in the Box
- 1 x Thermostat (19300-ZV5-043)
Installation Notes
- Ensure the engine is completely cool and disconnect the negative battery terminal.
- Locate the thermostat housing on the engine block or cylinder head. Place a drain pan underneath to catch any spilled coolant.
- Carefully remove the bolts securing the thermostat housing cover.
- Remove the old thermostat and gasket, taking note of the thermostat's orientation.
- Thoroughly clean the mating surfaces of both the housing and its cover to ensure a proper seal.
- Install the new thermostat in the same orientation as the original.
- Fit a new gasket (sold separately) onto the housing.
- Reinstall the housing cover and tighten the bolts to the manufacturer's specified torque.
- Reconnect the battery, top off the engine coolant if necessary, and check for leaks after starting the engine.
Troubleshooting & FAQ
How do I know if my thermostat is failing?
Common signs of a faulty thermostat include the engine overheating (indicated by a high temperature gauge reading) or the engine failing to reach its normal operating temperature, causing it to run too cool.
What temperature does this thermostat open at?
This thermostat is designed to begin opening at a coolant temperature of 72°C (162°F) to allow coolant to circulate through the engine.
Is a gasket included with this thermostat?
This package contains the thermostat only. The required housing gasket (Honda part #19351-ZV5-000) must be purchased separately to ensure a leak-free installation.
Will this fit my BF150 engine?
No, this thermostat is specifically designed for Honda 20-130 HP models from approximately 1999–2003. It will not fit a BF150. Always check your engine's service manual for the correct part number for your specific model and year.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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