90401-ZY6-000 Honda Marine Head Cover Washer | Genuine OEM Outboard Part

🔧 Product Description

Genuine Honda Cylinder Head Cover Sealing Washer - Part Number: 90401-ZY6-000

A genuine Honda sealing/cushion washer used beneath the cylinder-head cover fasteners on the ZY6 inline-four engine family. It distributes clamping load and helps seal the fastener point against engine-oil seepage.

⚙️ Key Features

• Genuine Honda head-cover fastener washer
• Oil- and heat-resistant sealing material
• Maintains even clamp load around the cylinder-head cover
• Six washers are used on the verified BF135A head-cover arrangement; supplied individually

🚤 Compatibility

Commonly used on

• Honda BF115D
• Honda BF135A
• Honda BF150A
• Later related model revisions only where the cylinder-head cover diagram lists 90401-ZY6-000

Typically suits

• HP Range: 115-150 HP
• Engine Type: 2.4-litre inline four-cylinder EFI four-stroke outboard
• Year Range: Approximately 2004 onward
• Serial / Identification Range: Confirm the complete frame serial and head-cover fastener diagram. Quantity required is controlled by the specific cover arrangement.

🔌 Function

Distributes fastener pressure and seals around the head-cover mounting point to help retain engine oil.

⚠️ Common Signs of Failure

• Oil seepage around a head-cover fastener
• Washer is cracked, hardened or permanently flattened
• Head-cover gasket has been replaced and the original washers no longer seal
• Uneven cover clamping caused by damaged washers

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 90401-ZY6-000 - current verified Honda service reference
• No later direct Honda supersession confirmed

OEM / Related Numbers

• 90401-ZY6-000
• 90401ZY6000

Aftermarket / Verified Equivalents

• No verified direct aftermarket equivalent

📦 Condition

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