The Honda 16166-Z8T-921 Main Nozzle is a genuine OEM component designed for GX340 horizontal shaft engines. Sourced directly from Honda, this nozzle meets the same specifications as the part installed at the factory, ensuring the carburetor delivers the correct air-fuel mixture for consistent, dependable engine performance. If your GX340 engine is running rich, lean, or stumbling under load, a worn or damaged main nozzle is a common cause — and this is the correct OEM replacement to restore it.
Key Features
- OEM Fuel Metering Accuracy — genuine Honda construction ensures the orifice diameter matches the original specification, so the carburetor meters fuel at the correct rate across the throttle range
- Direct OEM Replacement — this part installs in place of the original with no modification; confirm fitment using part number 16166-Z8T-921 against your engine's parts diagram
- GX340 Fitment — built specifically for GX340 horizontal shaft engines; verify your engine's serial number against the fitment table before ordering, as Honda supersedes parts at production serial breaks
- Restored Engine Response — a correctly sized and undamaged main nozzle eliminates lean stumble, rich fouling, and poor throttle response that a worn or clogged original causes
The main nozzle is a precision-metered jet inside the carburetor's main circuit. As engine load increases and the throttle opens, fuel is drawn through the nozzle and mixed with incoming air before entering the cylinder. The nozzle's bore diameter controls exactly how much fuel is delivered at mid-to-high throttle — if it is worn oversize, blocked with varnish, or damaged, the engine will run erratically, lose power, or refuse to reach full speed. Replacing this nozzle with a genuine Honda part restores the carburetor to its original fuel delivery characteristics and brings the GX340 back to its specified operating condition.
Part Details
| Part Number | 16166-Z8T-921 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Main Nozzle |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX340 | 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.
