Honda 91309-ML7-003 O-Ring (9.6X2.6)

The Honda 91309-ML7-003 O-Ring (9.6X2.6) is a genuine OEM sealing ring designed for BF4, BF5, BF6, and BF50 outboard motors. As an authentic Honda part, it is manufactured to the exact dimensions and material specifications called for in the original build, ensuring a proper seal without the guesswork of adapting an off-spec substitute. Confirm your motor's serial number against the fitment table before ordering, as Honda supersedes parts at specific serial breaks and the correct listing for your unit matters.

Key Features

• Exact-Dimension OEM Seal — at 9.6 x 2.6 mm, this O-ring matches Honda's own specification for cross-section and inner diameter, delivering the seating depth and compression needed to hold a leak-free seal in the application it was engineered for.
• Direct OEM Replacement — sourced directly from Honda, part number 91309-ML7-003 drops into place without modification, restoring the assembly to its original sealed condition.
• Broad Outboard Coverage — listed for BF4, BF5, BF6, and BF50 portable and outboard motors; verify your serial number against the compatibility table to confirm the correct fit for your specific unit.
• Leak Prevention — a compromised or hardened O-ring allows fluid or pressure to bypass the seal point, which can lead to loss of lubrication or fluid ingress in a marine environment where reliability is non-negotiable.

An O-ring is a circular sealing element that sits in a machined groove between two mating surfaces or around a fitting, creating a pressure-tight barrier that prevents fluid or air from escaping the joint. In an outboard motor, O-rings appear throughout the fuel, oil, and cooling systems, where even a minor leak can compromise performance or cause damage during operation on the water. When an O-ring hardens, cracks, or takes a compression set over time, it loses its ability to conform to the mating surfaces and the seal fails — replacing it with the correct OEM part restores the integrity of the assembly and prevents the cascading problems a small leak can cause in a marine environment.

Part Details

Compatibility & Fitment

Verify Before You Order

Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.

Why Buy From DHS Equipment

Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.

Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.