The Honda 16166-Z3S-003 Main Nozzle is a genuine OEM component designed for GX440 horizontal shaft engines. Sourced directly from Honda, this nozzle meets the exact specifications of the original part it replaces, ensuring the carburetor delivers the correct fuel-to-air mixture your engine depends on. If your GX440 engine is running rough, hesitating under load, or displaying signs of fuel delivery issues, a worn or clogged main nozzle is a common cause — and this OEM replacement restores proper metering performance.
Key Features
- Correct Fuel Metering — as a genuine Honda OEM part, this nozzle is manufactured to the original bore diameter and flow specification, maintaining the precise fuel delivery the GX440 carburetor was designed around
- Direct OEM Replacement — this nozzle installs into the GX440 carburetor the same way the original did, with no modification needed to the fuel system
- GX440 Fitment — built specifically for GX440 horizontal shaft engines; verify your engine serial number against the fitment table to confirm the correct part for your serial range
- Restore Engine Performance — a worn or fouled main nozzle disrupts the main fuel circuit, causing lean running, stumbling at mid-to-high throttle, and hard starting; replacing it returns the engine to its designed operating range
The main nozzle is a precision-drilled jet fitted inside the carburetor body that meters fuel flow from the float bowl into the main fuel circuit. At higher throttle positions, the venturi draws fuel through this nozzle in a calibrated stream, mixing it with incoming air to form the combustible charge the engine needs. Because the orifice is extremely small, even partial blockage from varnish deposits or debris can disrupt the fuel-air ratio significantly, leading to lean operation, loss of power, and rough running under load. Replacing a compromised nozzle with a genuine Honda part, part number 16166-Z3S-003, restores the carburetor's fuel delivery to the correct specification for the GX440 engine.
Part Details
| Part Number | 16166-Z3S-003 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Main Nozzle |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX440 | 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.
