The Honda 12000-Z0T-406 Cylinder Assembly (Oil Alert) is a genuine OEM component designed for GX160 horizontal shaft engines, WB20 water pumps, WB30 water pumps, and WMP20 water pumps. As a direct Honda OEM part, it is manufactured to the same specifications as the original, ensuring a proper fit without rework or adaptation. This assembly incorporates the Oil Alert provisions built into the original casting, making it the correct choice when rebuilding or replacing the core structure on these machines. Verify your unit's serial number against the fitment table before ordering, as Honda supersedes parts at production breaks.
Key Features
- Genuine OEM Construction — cast and machined to Honda's original dimensional specification, so bore geometry, oil alert provisions, and all mounting features align exactly with the original assembly.
- Oil Alert Integration — this cylinder assembly includes the Oil Alert system provisions built into the casting, the variant qualifier that distinguishes it from non-Oil Alert versions. Confirm your engine or pump uses this configuration before purchasing.
- Broad Fitment — covers GX160 horizontal shaft engines as well as WB20, WB30, and WMP20 water pumps, including multiple serial ranges within each model; cross-check your serial number against the fitment table to confirm applicability.
- Core Engine Reliability — a worn, cracked, or damaged cylinder compromises bore sealing, oil retention, and Oil Alert function; replacing it with this genuine assembly restores the structural and mechanical integrity the engine or pump depends on.
The cylinder assembly is the main structural casting of the engine — it houses the piston and bore, forms the foundation for the crankcase, and supports the mounting of the cylinder head above. On engines equipped with Oil Alert, the casting also incorporates the low-oil sensor provisions that shut the engine down before oil starvation causes internal damage. When the cylinder bore wears beyond serviceable limits, or when the casting itself is damaged, the entire engine's ability to generate and hold compression is compromised, leading to hard starting, power loss, and excessive oil consumption. Replacing the cylinder assembly with a genuine OEM unit restores the original bore condition and ensures the Oil Alert system continues to function as designed.
Part Details
| Part Number | 12000-Z0T-406 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Cylinder Assembly (Oil Alert) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX160 | All |
| Water Pump | WB20, WB30, WMP20 | 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.
