Mikuni Air Box Adapter O-Ring Seal

Genuine Mikuni air box adapter O-ring seal for V-twin motorcycles, engineered to create a tight seal between the air box and carburetor adapter. Direct-fit OEM replacement part for Harley-Davidson and Indian Motorcycle carbureted models.

Features

• Genuine Mikuni OEM part
• Air box to carburetor adapter seal
• V-twin motorcycle application

Specifications

• Brand: Mikuni
• Manufacturer Part #: FHS42/003
• Length: 4.4 in
• Width: 3.3 in
• Height: 0.3 in
• Weight: 0.05 lbs
• Country of Origin: Japan

Fitment

Fits carbureted V-twin motorcycles, including Harley-Davidson and Indian Motorcycle models equipped with Mikuni carburetors.

Frequently Asked Questions

What does this seal do?

The O-ring creates an airtight seal between your air box and the carburetor adapter, preventing vacuum leaks and ensuring proper fuel-air mixture.

How do I know if my O-ring needs replacement?

Replace if you notice an air leak at the adapter joint, hesitation on acceleration, or if the seal appears cracked or hardened during inspection.

Will this fit my fuel-injected Harley?

No — this is for carbureted V-twin models only. Fuel-injected bikes use different intake components.

Is this a genuine Mikuni part?

Yes — this is an OEM Mikuni component, not an aftermarket alternative.