The Honda 16166-Z1C-D21 Main Nozzle is a genuine OEM component designed for GX390 horizontal shaft engines, EB4000, EB5000, EB6500, EM4000, EM5000, and EM6500 generators, and HS1336 and HSM1336 two-stage snow blowers. As a direct Honda OEM part, this nozzle is manufactured to the same specification as the original, ensuring correct fuel metering and consistent carburetor performance across every application it serves. Confirm your unit's serial number against the fitment table before ordering, as Honda supersedes parts at serial breaks and multiple configurations share this carburetor family.
Key Features
- Precise Fuel Metering — as a genuine OEM main nozzle, the orifice diameter is calibrated to Honda's original specification, delivering the correct fuel-to-air ratio under load for clean, consistent power output
- Broad OEM Fitment — covers GX390 horizontal shaft engines, EB and EM series generators, and HS1336 and HSM1336 two-stage snow blowers, making this a widely applicable service part across Honda's lineup
- Direct Carburetor Replacement — this nozzle installs in place of the worn or damaged original with no alterations, restoring the carburetor's main circuit to proper operation
- Serial Number Verification Recommended — Honda updates carburetor components at production serial breaks; always match your machine's serial number to the fitment table to confirm this is the correct nozzle for your unit
The main nozzle is the primary fuel-delivery passage inside the carburetor's main circuit. It meters the volume of fuel drawn into the venturi under mid-to-high throttle conditions, directly controlling the mixture strength the engine receives during loaded operation. When the main nozzle wears, becomes blocked, or is damaged, the engine will run lean, lose power under load, surge, or refuse to reach full speed — symptoms that closely mimic other carburetor faults but are resolved only by restoring the nozzle to its original calibrated diameter.
Part Details
| Part Number | 16166-Z1C-D21 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Main Nozzle |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | EB4000, EB5000, EB6500, EM4000, EM5000, EM6500 | All |
| Horizontal Shaft Engine | GX390 | 1000001-1703009 |
| Two-Stage Snow Blower | HS1336, HSM1336 | 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.
