The Honda 14721-ZE9-900 Exhaust Valve (Stellite) is a genuine OEM replacement built for GX390 horizontal shaft engines and GXV340 and GXV390 vertical shaft engines. As a factory-sourced component, this exhaust valve is manufactured to the same specifications as the part that left the factory, ensuring a proper seat-to-valve fit and consistent sealing performance. Confirm your engine's serial number against the fitment table before ordering, as Honda supersedes parts at production breaks and more than one variant may be listed across these models.
Key Features
- Stellite-Faced Seat Surface — the Stellite facing on the valve head is a hard, heat-resistant alloy specifically chosen for the high-temperature demands of the exhaust seat, providing durability that a standard steel valve face cannot match in this position
- Genuine OEM Sourcing — supplied directly through Honda's parts network, part number 14721-ZE9-900 is an exact factory replacement with no dimensional adjustments required at installation
- Engine Coverage — designed for GX390 horizontal shaft engines and GXV340 and GXV390 vertical shaft engines, including both shaft orientations in Honda's mid-displacement commercial range
- Verify Serial Number Before Ordering — Honda releases revised valve specifications at engine serial breaks; check your engine's serial number against the compatibility table to confirm this is the correct variant for your unit
- Restored Compression and Combustion Sealing — a worn or burned exhaust valve allows combustion gases to escape past the seat, causing hard starting, lost compression, and elevated exhaust temperatures; replacing it restores the tight seal the engine depends on
The exhaust valve controls the exit of spent combustion gases from the cylinder. It opens on the exhaust stroke to allow hot gases to escape into the exhaust port, then closes tightly against its seat to seal the cylinder during compression and combustion. Because the exhaust valve is exposed to extreme heat every time the engine fires, its face and seat are among the most thermally stressed components in the valvetrain. When the valve face or seat wears or burns, the seal breaks down — compression drops, power falls off, and the engine may become difficult to start. The Stellite facing on this valve is specifically intended to withstand those elevated temperatures and maintain a reliable seal over an extended service life.
Part Details
| Part Number | 14721-ZE9-900 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Exhaust Valve (Stellite) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX390 | All |
| Vertical Shaft Engine | GXV340, GXV390 | 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.
