The Honda 16028-Z0N-004 Pilot Screw Set is a genuine OEM Pilot Screw Set designed for GCV520, GCV530, GXV520, and GXV530 vertical shaft engines. As a direct Honda OEM replacement, this set restores the factory-calibrated fuel and air metering that keeps the carburetor performing at its best. Confirm your engine's serial number against the fitment table before ordering, as Honda supersedes parts at serial breaks across these engine families.
Key Features
- OEM Fuel Metering Accuracy — genuine Honda construction means the pilot screw taper, seat angle, and thread pitch match the carburetor body exactly, preserving correct idle mixture calibration
- Direct Carburetor Replacement — this set installs into the carburetor on GCV520, GCV530, GXV520, and GXV530 vertical shaft engines without alteration, restoring the adjustment range the original screw provides
- Serial Number Verification Recommended — Honda issues part supersessions at production breaks within these engine series; cross-check your engine serial number against the fitment table to confirm this is the correct set for your unit
- Idle Quality Restored — a worn or damaged pilot screw causes rough idling, stalling, and poor throttle response at low RPM; replacing it with the correct OEM set brings idle quality back to spec
The pilot screw is a precision metering component inside the carburetor that regulates the fuel-to-air ratio at idle and light-throttle operation. It works by controlling the volume of fuel-enriched mixture that passes through the pilot circuit, and its tapered tip seats against a calibrated port to fine-tune that flow. When the screw wears, its seat degrades, or the o-ring fails, the engine can no longer maintain a stable idle — symptoms include hanging RPM, stumbling on acceleration, and difficulty starting. Replacing the pilot screw set with part number 16028-Z0N-004 restores the precise metering the carburetor was built around.
Part Details
| Part Number | 16028-Z0N-004 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Pilot Screw Set |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Vertical Shaft Engine | GCV520, GCV530, GXV520, GXV530 | 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.
