The Honda 16221-Z0H-010 Carburetor Gasket is a genuine OEM replacement designed for FG110 tillers, GX25 horizontal shaft engines, HHT25 trimmers, UMC425 trimmers, and UMC435 trimmers. As an authentic Honda part, this gasket is produced to the same standards as the original, ensuring a proper seal between the carburetor and the engine. Confirm your machine's serial number against the fitment table before ordering, as Honda periodically supersedes parts at production breaks.
Key Features
- OEM Sealing Integrity — manufactured by Honda to deliver the correct carburetor-to-engine seal, preventing air leaks that would disrupt fuel metering and mixture control.
- Direct OEM Replacement — engineered to match the original gasket profile exactly, allowing straightforward installation with no fitting adjustments during carburetor service or rebuild.
- Broad Fitment — covers FG110 tillers, GX25 engines, and HHT25, UMC425, and UMC435 trimmers; verify your serial number against the fitment table to confirm the correct variant for your unit.
- Restored Fuel Efficiency — a sound carburetor gasket keeps unmetered air out of the fuel circuit, maintaining the correct air-fuel ratio and consistent power delivery from the engine.
The carburetor gasket forms an airtight seal at the joint between the carburetor body and the engine intake. Without this seal, uncontrolled air enters the fuel circuit, leaning out the mixture and causing symptoms such as rough idling, hard starting, and loss of power under load. When this gasket deteriorates, hardens, or is disturbed during service, it must be replaced to restore consistent engine operation — skipping it during a carburetor rebuild is a common cause of repeat carb problems.
Part Details
| Part Number | 16221-Z0H-010 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Carburetor Gasket |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX25 | All |
| Tiller | FG110 | 2997334-9999999 |
| Trimmer | HHT25 | 2072561-9999999 |
| Trimmer | UMC425, UMC435 | 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.
