The Honda 16028-Z0A-004 Pilot Screw Set is a genuine OEM component designed for GCV520, GCV530, GXV520, and GXV530 vertical shaft engines. As a direct-sourced Honda part, it delivers the exact calibration needed for proper low-speed fuel metering on these engines. Confirm your engine's serial number against the fitment table before ordering, as Honda issues part supersessions at specific serial breaks within these families.
Key Features
- Exact Fuel Circuit Calibration — genuine OEM specification ensures the pilot circuit delivers the correct air-fuel mixture at idle and low throttle, where aftermarket tolerances can cause stumbling or rough running
- Direct OEM Replacement — sourced directly from Honda, this set installs in place of the original with no adaptation, maintaining the carburetor's designed fuel delivery characteristics
- Broad Vertical Shaft Fitment — covers GCV520, GCV530, GXV520, and GXV530 vertical shaft engines; verify your serial number against the fitment table to confirm the correct set for your unit
- Idle Quality and Throttle Response — a worn or improperly set pilot screw causes rough idling, hard starting, and poor low-speed response; a fresh OEM set restores crisp, stable engine behavior from cold start through warm-up
The pilot screw is a precision metering component in the carburetor's pilot circuit, responsible for regulating the mixture of air and fuel that feeds the engine at idle and light throttle openings. Its position — adjusted to fine tolerances during carburetor assembly — determines idle quality, cold-start behavior, and low-load responsiveness. When the pilot screw wears, its o-ring deteriorates, or its taper seat is damaged, the engine loses the ability to hold a steady idle and may surge, hunt, or stall under light loads. Replacing the full set restores the pilot circuit to its original operating condition.
Part Details
| Part Number | 16028-Z0A-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.
