The Honda 16166-Z4H-WB1 Main Nozzle is a genuine OEM replacement designed for GX120 horizontal shaft engines and WB20, WB30, WH15, and WH20 water pumps. As a direct Honda OEM component, this nozzle is manufactured to the same specification as the original, ensuring the carburetor meters fuel at the correct rate for consistent engine performance. Confirm your unit's serial number against the fitment table before ordering, as Honda supersedes nozzle specifications at production breaks across these models.
Key Features
- Correct Fuel Metering — genuine OEM construction ensures the nozzle orifice matches Honda's original specification for accurate fuel delivery at all throttle positions
- Direct Carburetor Fit — this nozzle installs into the carburetor assembly without modification, restoring the fuel circuit to its original condition
- Broad Model Coverage — fits GX120 horizontal shaft engines and WB20, WB30, WH15, and WH20 water pumps; check your serial number against the fitment table to confirm the correct application
- Engine Responsiveness — a worn or clogged main nozzle causes lean running, rough idle, and power loss; replacing it with a correctly sized OEM part restores crisp throttle response and steady operation
The main nozzle is a precision-calibrated jet inside the carburetor that controls how much fuel enters the airstream under normal running and load conditions. Fuel is drawn through the nozzle by the venturi effect created as air flows through the carburetor throat, mixing with that air before it enters the combustion chamber. When the nozzle becomes worn, corroded, or partially blocked, fuel delivery is disrupted — resulting in a lean mixture, hard starting, erratic RPM, or a loss of power under load.
Part Details
| Part Number | 16166-Z4H-WB1 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Main Nozzle |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX120 | All |
| Water Pump | WB20, WB30, WH15, WH20 | 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.
