19300-ZV5-043 Honda Marine Thermostat | Genuine OEM Outboard Part

🔧 Product Description

Genuine Honda Marine 72°C Thermostat Assembly - Part Number: 19300-ZV5-043

A genuine Honda 72°C thermostat for a broad group of BF20-BF130 four-stroke outboards. It is the latest service version in the long ZV5 thermostat chain.

⚙️ Key Features

• Factory opening temperature approximately 72°C
• Wax-element temperature control
• Latest ZV5 thermostat revision
• Direct replacement for four earlier Honda versions
• Used with cover gasket 19351-ZV5-000

🚤 Compatibility

Commonly used on

• Honda Marine four-stroke outboard cooling-system applications

Typically suits

• Engine models:
• BF20A
• BF25A
• BF30A
• BF35A
• BF40A/B
• BF45A
• BF50A
• BF75A
• BF90A
• BF115A
• BF130A
• HP Range: 20HP-130HP
• Engine Type: Honda four-stroke outboard
• Year Range: Approximately 1990s-2007, model dependent

🔌 Function

Restricts cooling-water flow while the engine warms, then opens near 72°C to maintain efficient operating temperature.

⚠️ Common Signs of Failure

• Engine runs too cold and idles poorly
• Overheating because the thermostat remains closed
• Corrosion or salt deposits around the valve
• Thermostat opens late or only partially
• Temperature warning or uneven cylinder temperature

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 19300-ZV5-043 → Supersedes 19300-ZV5-033
• 19300-ZV5-033 → Supersedes 19300-ZV5-023
• 19300-ZV5-023 → Supersedes 19300-ZV5-013
• 19300-ZV5-013 → Supersedes 19300-ZV5-003

OEM / Related Numbers

• Honda: 19300-ZV5-043
• Honda: 19300-ZV5-033
• Honda: 19300-ZV5-023
• Honda: 19300-ZV5-013
• Honda: 19300-ZV5-003

Aftermarket / Verified Equivalents

• Sierra: 18-3630
• Recmar: REC19300-ZV5-043
• Aftermarket reference: OSTZV5

📦 Condition

• Genuine Honda Marine OEM part
• Brand new
• Supplied in original or equivalent packaging