23172-ZY9-003 Honda Marine Mount Case Gasket | Genuine OEM Outboard Part

🔧 Product Description

Genuine Honda BF75D / BF80A / BF90D / BF100A Mount Case Gasket - Part Number: 23172-ZY9-003

A genuine Honda mount-case gasket for the later 75-100HP inline-four outboard platform. It seals the powerhead-to-mount-case interface and maintains separation between exhaust, cooling-water and surrounding lower-cowling cavities.

⚙️ Key Features

• Genuine Honda mount-case sealing gasket
• Correct ZY9 exhaust and cooling-water passage layout
• High-temperature and saltwater-resistant material
• Required whenever the powerhead or mount case is separated

🚤 Compatibility

Commonly used on

• Honda BF75D
• Honda BF80A
• Honda BF90D
• Honda BF100A

Typically suits

• HP Range: 75-100 HP
• Engine Type: Inline four-cylinder EFI four-stroke outboard
• Year Range: 2007 onward, model dependent
• Serial / Identification Range: Common frame families include BF75D BBAJ, BF90D BBCJ and BF100A BBMJ. Confirm the complete frame serial and mount-case diagram before installation.

🔌 Function

Seals the powerhead base and mount-case joint against exhaust-gas and cooling-water leakage.

⚠️ Common Signs of Failure

• Exhaust soot or water inside the lower cowling
• Cooling-water leakage from the powerhead base
• Burnt or eroded gasket edges
• Leakage after powerhead or mount-case removal

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 23172-ZY9-003 - current verified Honda service reference
• No later direct Honda supersession confirmed

OEM / Related Numbers

• 23172-ZY9-003
• 23172ZY9003

Aftermarket / Verified Equivalents

• No verified direct aftermarket equivalent

📦 Condition

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