The Honda 16166-ZN4-801 Main Nozzle is a genuine OEM replacement designed for GXH50 horizontal shaft engines, GXV50 and GXV57 vertical shaft engines, and the WX15 water pump. As a direct Honda OEM component, this nozzle is manufactured to the same specification as the original, ensuring correct fuel metering without any adjustment or calibration guesswork. Confirm your model and serial number against the fitment table before ordering, as Honda supersedes parts at serial breaks and the correct nozzle varies by production run.
Key Features
- Correct Fuel Metering — manufactured to Honda's original jetting specification, this Main Nozzle delivers the precise fuel flow the carburetor requires for clean throttle response and consistent power output
- Genuine OEM Component — sourced directly from Honda, part number 16166-ZN4-801 matches the original nozzle exactly, so installation requires no modification to the carburetor body
- Broad Fitment — covers GXH50 horizontal shaft engines, GXV50 and GXV57 vertical shaft engines, and WX15 water pumps; check your serial number against the fitment table to confirm the correct nozzle for your unit
- Restores Engine Performance — a worn or blocked main nozzle causes lean running, rough idle, and loss of power under load; replacing it with this OEM part brings fuel delivery back to spec
The main nozzle is a precision-drilled metering jet seated inside the carburetor body. It controls the volume of fuel drawn into the airstream during mid-range and wide-open throttle operation, making it the primary determinant of the engine's air-fuel mixture under load. When the nozzle's orifice becomes worn, varnished, or partially blocked by fuel deposits, the engine receives an incorrect mixture — typically running lean — which shows up as hesitation, surging, overheating, or a loss of output power. Replacing a degraded nozzle with a correct OEM part restores the carburetor's fuel curve and returns the engine or pump to its intended operating condition.
Part Details
| Part Number | 16166-ZN4-801 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Main Nozzle |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GXH50 | All |
| Vertical Shaft Engine | GXV50, GXV57 | All |
| Water Pump | WX15 | 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.
