The Honda 91351-MG7-003 O-Ring (20.8X2.4) is a genuine OEM sealing ring designed for a wide range of Honda outboard motors, including the B75, BF4, BF5, BF6, BF8, BF9, BF15, BF25, BF30, BF35, BF40, BF45, BF50, BF75, and BF90. As an authentic Honda OEM component, this O-ring is manufactured to the precise dimensional specification — 20.8 mm inner diameter by 2.4 mm cross-section — ensuring a leak-free seal where it matters most. Verify your motor's serial number against the fitment table to confirm part number 91351-MG7-003 is correct for your specific unit before ordering.
Key Features
- Genuine OEM Sealing Integrity — manufactured to Honda's exact dimensional tolerances, this O-ring delivers the compression and fluid resistance required to maintain a proper seal in outboard motor applications.
- Precise Dimensional Specification — the 20.8 x 2.4 mm profile is not a general-use sizing; it is the exact cross-section Honda specifies for this application, ensuring correct groove seating and consistent sealing pressure.
- Broad Outboard Fitment — listed for Honda portable and mid-range outboard motors including the B75, BF15, BF25, BF35, BF40, BF45, BF50, BF75, BF90, and more. Check your serial number against the fitment table, as Honda supersedes sealing components at production breaks.
- Leak Prevention — a degraded or incorrectly sized O-ring allows fluid to bypass the seal, leading to leaks that can affect motor performance and reliability on the water. This OEM replacement restores the original sealing condition.
An O-ring is a precision loop seal used throughout Honda outboard motors to prevent fluid — whether oil, water, or fuel — from escaping past a joint, housing, or fitting. When seated correctly in its machined groove, the ring is compressed between two mating surfaces to form a fluid-tight barrier. Over time, heat cycling, exposure to fuel, oil, and salt water cause O-rings to harden, crack, or deform, breaking the seal and allowing leaks that can worsen rapidly if left unaddressed. Replacing a worn O-ring with the correct OEM part restores the integrity of the sealed joint and protects the surrounding components from fluid intrusion.
Part Details
| Part Number | 91351-MG7-003 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | O-Ring (20.8X2.4) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Outboard Motor | BF25, BF30, BF35, BF40, BF45, BF50, BF75, BF90 | All |
| Portable Outboard Motor | B75, BF4, BF5, BF6, BF8, BF9, BF15, BF100 | All |
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.
