19300-ZW9-003 Honda Marine Thermostat | Genuine OEM Outboard Part

🔧 Product Description

Genuine Honda Marine 60°C Thermostat Assembly - Part Number: 19300-ZW9-003

A genuine Honda 60°C thermostat used across several small, mid-range and selected large four-stroke outboard cooling circuits. Because Honda reused this thermostat in different locations, engine model and thermostat position must be checked.

⚙️ Key Features

• Factory 60°C opening specification
• Wax-element thermostat construction
• Shared across multiple Honda engine families
• Direct OEM replacement
• Used with the correct model-specific cover seal or O-ring

🚤 Compatibility

Commonly used on

• Honda Marine four-stroke outboard cooling-system applications

Typically suits

• Engine models:
• BF8B/D, BFP8B/D, BF9.9D and BFP9.9D
• BF10B/D and BFP10B/D
• BF15D and BF20D
• BF25D and BF30D
• BF40A/D/E and BF50A/D
• BF60A and BFP60A
• BF75D, BF80A, BF90D and BF100A
• Selected early BF200A and BF225A thermostat positions
• HP Range: 8HP-225HP, model and thermostat position dependent
• Engine Type: Honda four-stroke outboard
• Year Range: Approximately 2001 onward

🔌 Function

Controls coolant temperature by opening near 60°C and directing water through the engine once the required warm-up temperature is reached.

⚠️ Common Signs of Failure

• Engine remains cold or produces excessive condensation
• Overheat alarm from a stuck-closed thermostat
• Thermostat corroded with salt deposits
• Unstable temperature during idle or cruise
• Reduced fuel economy from incorrect operating temperature

🔄 Supersession & Cross Reference

OEM Supersession Chain

• No supersession; current Honda OEM reference

OEM / Related Numbers

• Honda: 19300-ZW9-003
• Related Honda references used in aftermarket catalogues: 19300-881-741 and 19300-921-003

Aftermarket / Verified Equivalents

• Sierra: 18-3628
• Recmar: REC19300-ZW9-003
• Parsun/aftermarket reference: PAF15-07000031

📦 Condition

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