The Honda 16028-ZN1-801 Throttle Screw Set is a genuine OEM component designed for GX620 and GX670 horizontal shaft engines and GXV620 and GXV670 vertical shaft engines. As a factory-original part, it is manufactured to the same specification as the hardware that left the assembly line, ensuring the throttle system adjusts and holds position exactly as intended. This Throttle Screw Set is the correct service replacement when the original screws are worn, stripped, or lost, and it installs directly in place of the outgoing hardware. Always confirm your engine's serial number against the fitment table before ordering, as Honda updates part numbers at production breaks.
Key Features
- Genuine OEM Throttle Hardware — factory-original screws that preserve the precise throttle adjustment range and retention your engine's carburetor system requires, with no guesswork on thread form or sizing.
- Direct OEM Replacement — part number 16028-ZN1-801 drops in as a like-for-like replacement, restoring the throttle assembly to its original operating condition without rework or modification.
- Broad V-Twin Fitment — covers GX620 and GX670 horizontal shaft engines as well as GXV620 and GXV670 vertical shaft engines, making this set applicable across Honda's large-displacement V-twin lineup.
- Serial Number Verification Advised — Honda supersedes components at production serial breaks, so cross-reference your engine's serial number with the fitment table to confirm this is the correct set for your unit.
- Throttle Control Integrity — worn or damaged throttle screws allow the carburetor's throttle circuit to drift out of adjustment, leading to erratic governor response, unstable engine speed, and difficulty holding a set RPM under load.
The Throttle Screw Set is part of the carburetor's throttle circuit, where it secures and positions the components that regulate airflow and engine speed. When these screws are correctly seated, the throttle responds smoothly to governor input and holds a stable RPM across varying load conditions. If the screws become stripped, corroded, or lost, the throttle linkage loses its reference point, causing the engine to hunt, surge, or fail to govern properly under load.
Part Details
| Part Number | 16028-ZN1-801 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Throttle Screw Set |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX620, GX670 | All |
| Vertical Shaft Engine | GXV620, GXV670 | 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.
