The Honda 16570-ZK3-D21 Control Assembly is a genuine OEM component designed for GX340 and GX390 horizontal shaft engines. As a direct OEM replacement, this assembly is sourced from Honda and built to the same specification as the original unit it replaces. This part is the correct choice for GX340 and GX390 engines — confirm your engine's serial number against the fitment table before ordering, as Honda supersedes parts at production breaks.
Key Features
- Genuine Honda OEM — sourced directly from Honda, ensuring the assembly matches the original in function and form for GX340 and GX390 horizontal shaft engines.
- Exact OEM Replacement — replaces the original Control Assembly with no guesswork; the part number 16570-ZK3-D21 cross-references directly in Honda's parts catalogue.
- Serial Number Matters — Honda updates parts at production serial breaks; verify your engine's serial number against the fitment table to confirm this is the correct assembly for your unit.
- Engine Control Integrity — a functioning control assembly keeps throttle and governor response consistent; a worn or damaged assembly leads to erratic engine speed and loss of output control.
The Control Assembly on a GX340 or GX390 horizontal shaft engine integrates the throttle and governor linkage into a single serviceable unit, coordinating the relationship between operator input and engine speed. It works in conjunction with the governor system to maintain steady RPM under varying load conditions, which is critical for equipment that demands consistent power output. When this assembly wears, loosens, or fails, the engine may hunt, surge, or fail to hold a set speed — replacing it with a genuine Honda part restores accurate throttle and governor coordination.
Part Details
| Part Number | 16570-ZK3-D21 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Control Assembly |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX340, GX390 | 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.
