The Honda 14721-ZJ1-800 Exhaust Valve (Stellite) is a genuine OEM component built for GX610 and GX620 horizontal shaft engines and GXV610 and GXV620 vertical shaft engines. As a direct Honda OEM part, it is manufactured to the same specification as the valve installed at the factory, ensuring correct head dimensions, stem diameter, and seat geometry for a proper seal. This exhaust valve is the right choice for any rebuild or top-end service on the GX610, GX620, GXV610, or GXV620, and buyers should verify their engine's serial number against the fitment table to confirm the correct part for their serial range.
Key Features
- Stellite-Faced Seat Surface — the Stellite facing on the valve head delivers superior heat and wear resistance at the exhaust seat, where temperatures and combustion pressures are highest in these large-displacement V-twin engines.
- Genuine Honda OEM Part — sourced directly from Honda, part number 14721-ZJ1-800 carries the exact head diameter, stem dimensions, and overall length required for a proper valve-to-seat contact pattern without any fitting or grinding adjustments.
- Fits Both Shaft Orientations — covers GX610 and GX620 horizontal shaft engines alongside GXV610 and GXV620 vertical shaft engines; confirm your model and serial number against the fitment table before ordering.
- Combustion Sealing at the Exhaust Port — a correctly seating exhaust valve holds compression, prevents hot exhaust gas from escaping past the seat, and allows the engine to develop full power; a burned or worn valve causes hard starting, loss of compression, and rough running.
The exhaust valve sits in the cylinder head and opens on the exhaust stroke to release burned combustion gases from the cylinder. In these large-displacement Honda engines, the exhaust valve faces extreme thermal and mechanical stress every time the engine fires, making the quality of the valve face and seat contact critical to long-term compression retention. When the valve face or stem wears, burns, or fails to seat properly, the engine loses compression, runs roughly, and may become difficult or impossible to start without a cylinder head rebuild.
Part Details
| Part Number | 14721-ZJ1-800 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Exhaust Valve (Stellite) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX610, GX620 | All |
| Vertical Shaft Engine | GXV610, GXV620 | 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.
