The Honda 14781-MB4-000 Valve Cotter is a genuine OEM component designed for BF35, BF40, BF45, and BF50 outboard motors. As a factory-original part, it is manufactured to the exact specification Honda requires to retain the valve spring retainer securely in place. Confirm fitment by checking your outboard's serial number against the compatibility table before ordering.
Key Features
- Genuine OEM Construction — sourced directly from Honda, this cotter meets the exact dimensional tolerances required to lock the valve spring retainer without play or movement.
- Direct Replacement — engineered to install exactly as the original, with no modification needed to restore correct valvetrain retention in your outboard.
- Broad Outboard Fitment — covers BF35, BF40, BF45, and BF50 Honda outboard motors; verify your serial number against the fitment table, as Honda introduces part supersessions at serial breaks.
- Valvetrain Integrity — a worn or incorrectly seated cotter allows the valve spring retainer to shift, leading to valve drop and serious internal engine damage that can put your outboard out of service.
The valve cotter is a small split or tapered clip that locks the valve spring retainer onto the valve stem, holding the entire valve spring assembly under compression. In a four-stroke outboard engine like the BF35 through BF50 series, every intake and exhaust valve depends on this component to stay seated during operation. When a cotter wears, cracks, or loses its grip, the retainer can slip and the valve may fall into the cylinder — an outcome that causes immediate and severe internal damage. Replacing a suspect cotter at the first sign of valvetrain noise is straightforward preventive maintenance that protects the rest of the engine.
Part Details
| Part Number | 14781-MB4-000 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Valve Cotter |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Outboard Motor | BF35, BF40, BF45, BF50 | 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.
