The Honda 16551-ZA1-000 Governor Arm is a genuine OEM Governor Arm designed for Honda EB4000, EM4000, EMS4000, EMS4500, and EW170 generators. As a direct Honda OEM component, this part is manufactured to the same specification as the original, ensuring accurate linkage movement and correct governor response right out of the box. Confirm your unit's serial number against the fitment table before ordering, as Honda supersedes components at serial breaks and the correct part number varies by production run.
Key Features
- Genuine OEM Governor Linkage Geometry — manufactured by Honda to deliver the exact pivot travel and arm length the governor system depends on for stable speed control across load changes
- Direct OEM Replacement — matches the original mounting interface on EB4000, EM4000, EMS4000, EMS4500, and EW170 generators, so installation swaps straight in without modification
- Serial Number Verification Recommended — Honda updates part numbers at production breaks, so cross-check your generator's serial number against the compatibility table to confirm this is the correct arm for your unit
- Stable Output Frequency and Voltage — a worn or bent governor arm allows engine speed to hunt or surge, which causes fluctuating power output; a correctly functioning arm keeps the engine on speed under varying electrical loads
The governor arm is a mechanical link inside the governor assembly that translates the movement of the governor flyweights or spring into throttle position changes. As the load on a generator rises or falls, the governor system reads the resulting change in engine speed and moves the arm to open or close the throttle, bringing the engine back to its target RPM. When this arm is worn, bent, or has developed play at its pivot, the governor loses the ability to respond quickly and accurately, and the result is engine hunting, surging, or an inability to hold steady speed under load — all of which directly affect the quality and stability of the electrical output the generator delivers.
Part Details
| Part Number | 16551-ZA1-000 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Governor Arm |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | EB4000, EM4000, EMS4000, EMS4500 | All |
| Welder Generator | EW170 | 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.
