The Honda 12000-Z1D-409 Cylinder Assembly is a genuine OEM replacement built for the EM3800, EM4000, EM5000, and EM6500 generators. As a direct factory replacement sourced from Honda, this assembly meets the original design specifications and integrates with the engine components already in your unit. This part carries part number 12000-Z1D-409 and is the correct choice for operators restoring generator performance to as-built condition. Confirm your unit's serial number against the fitment table before ordering, as Honda supersedes components at specific serial breaks across this generator family.
Key Features
- Genuine Honda OEM Construction — manufactured to Honda's original specifications, ensuring the bore dimensions, port geometry, and mating surfaces match what the engine was designed around
- Engine-Integrity Fit — replaces the complete cylinder structure so pistons, rings, and other internal components seat and operate as Honda intended, without the tolerances that worn or damaged cylinders introduce
- Broad Generator Fitment — designed for the EM3800, EM4000, EM5000, and EM6500 generators; verify your serial number against the compatibility table to confirm the correct application for your unit
- Restores Full Power Output — a compromised cylinder leads to compression loss, excessive oil consumption, and reduced wattage output; replacing this assembly brings the engine back to its intended compression and efficiency
The cylinder assembly is the core structural and functional housing of the engine. It contains the bore through which the piston travels, and its internal surfaces — along with the piston rings — create the sealed combustion chamber that generates the mechanical energy powering the generator's alternator. When the cylinder bore is worn, scored, or cracked, compression drops and combustion gases escape past the rings, leading to hard starting, loss of power, increased fuel consumption, and oil burning. Replacing the cylinder assembly restores the compression necessary for the engine to produce its rated output and run cleanly under load.
Part Details
| Part Number | 12000-Z1D-409 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Cylinder Assembly |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | EM3800, EM4000, EM5000, EM6500 | 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.
