The Honda 16166-Z1D-D21 Main Nozzle is a genuine OEM replacement designed for Honda EB4000, EB5000, EB6500, EM4000, EM5000, and EM6500 generators. As a direct Honda OEM component, this main nozzle is manufactured to the same specification as the original, ensuring proper fuel metering in the carburetor. Honda supersedes parts across serial ranges, so confirm your generator's serial number against the fitment table before ordering to make sure part number 16166-Z1D-D21 is the correct match for your unit.
Key Features
- Correct Fuel Metering — as a genuine OEM part, this main nozzle is sized to Honda's original specification, delivering the precise fuel flow the carburetor requires for consistent generator output
- Direct OEM Replacement — this component installs in place of the original with no modification, restoring the carburetor to its as-built condition
- Broad Generator Fitment — covers Honda EB4000, EB5000, EB6500, EM4000, EM5000, and EM6500 generators; check your serial number against the fitment table to confirm applicability to your specific unit
- Restored Engine Response — a worn or clogged main nozzle disrupts the fuel-air mixture, causing hard starting, rough running, or power loss under load; replacing it returns the generator to stable, full-power operation
The main nozzle is a small-bore metering component inside the carburetor that controls the volume of fuel drawn into the airstream during mid-range and full-throttle operation. It works by allowing a calibrated amount of fuel to be pulled through by engine vacuum, mixing with incoming air to form the combustible charge the engine needs. When the nozzle becomes clogged with varnish or debris, or wears beyond its original bore size, the generator may run lean, surge, lose power, or fail to start reliably under load.
Part Details
| Part Number | 16166-Z1D-D21 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Main Nozzle |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | EB4000, EB5000, EB6500, EM4000, EM5000, EM6500 | 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.
