The Honda 14721-Z5T-900 is a genuine OEM Exhaust Valve designed for a wide range of Honda engines, generators, snow blowers, and water pumps — including GX340 and GX390 horizontal shaft engines, EB, EG, EM, EU, and EB-series generators, HS, HSM, and HSS two-stage snow blowers, and the WT40 water pump. As a genuine Honda part, this Exhaust Valve is manufactured to the same tolerances as the original, ensuring a direct, like-for-like replacement with no guesswork. Honda supersedes parts at production serial breaks, so verify your unit's serial number against the fitment table before ordering to confirm this is the correct valve for your machine.
Key Features
- Genuine OEM Valve Integrity — manufactured by Honda to the same dimensional and metallurgical specifications as the original, ensuring proper sealing against the valve seat and correct lift geometry through the full exhaust stroke.
- Broad Genuine Honda Fitment — covers GX340 and GX390 horizontal shaft engines, multiple EB, EG, EM, and EU generator models, HS928, HS1332, HS1336, HSM1336, HSS928, and HSS1332 two-stage snow blowers, and the WT40 water pump — confirm your model and serial number before ordering.
- Direct Drop-In Replacement — matches the stem diameter, head diameter, and overall length of the original valve, seating correctly in the existing valve guide without machining or adaptation.
- Combustion Efficiency Restored — a properly sealing exhaust valve allows the engine to build full compression and expel combustion gases cleanly; a worn or burnt valve causes hard starting, power loss, and rough running.
The exhaust valve is a critical component of the engine's four-stroke cycle. Positioned in the cylinder head, it opens at the end of the power stroke to allow spent combustion gases to exit the cylinder, then closes tightly to seal the combustion chamber during compression and ignition. When an exhaust valve wears, burns, or fails to seat correctly, compression drops, the engine loses power, and combustion gases can leak past the seat — leading to rough running, excessive fuel consumption, and eventually engine damage if left unaddressed. Replacing a worn exhaust valve with a genuine Honda part restores proper compression, clean exhaust scavenging, and consistent engine performance across every application this valve serves.
Part Details
| Part Number | 14721-Z5T-900 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Exhaust Valve |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | EG5000, EG6500 | 1431291-9999999 |
| Generator | EB3800, EB4000, EB5000, EB6500, EM3800, EM4000, EM5000, EM6500 | All |
| Horizontal Shaft Engine | GX340, GX390 | All |
| Inverter Generator | EU6500 | 1443635-9999999 |
| Inverter Generator | EB7000, EM7000 | All |
| Two-Stage Snow Blower | HS928, HS1332, HSS928, HSS1332 | 1443535-9999999 |
| Two-Stage Snow Blower | HS1336, HSM1336 | All |
| Water Pump | WT40 | 1432315-9999999 |
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.
