The Honda 12391-ZA0-000 Head Cover Gasket is a genuine OEM replacement designed for EL5000 and ES6500 generators, the EX5500 generator, and GX360 horizontal shaft engines. As a direct Honda OEM component, this gasket is manufactured to the same specifications as the original part, so it seats and seals exactly as intended without rework. Confirm your machine's serial number against the fitment table before ordering — Honda introduces part supersessions at specific serial breaks, and verifying your serial ensures you receive the correct version for your unit.
Key Features
- Genuine Honda OEM — sourced directly from Honda, this gasket carries the same material grade and dimensional tolerances as the part that left the factory, so the sealing surface mates correctly with the head cover and cylinder head.
- Leak-Free Head Cover Seal — a properly functioning head cover gasket prevents oil from escaping at the valve cover joint, keeping the engine clean and oil level stable through extended operation.
- Broad Fitment Across Honda Equipment — fits EL5000, ES6500, and EX5500 generators, as well as GX360 horizontal shaft engines; check your model and serial number to confirm applicability.
- Serial Number Verification Recommended — Honda updates part numbers at production serial breaks; cross-check your unit's serial number against the compatibility table to confirm this is the correct gasket for your machine.
The head cover gasket sits between the valve or head cover and the top of the engine, creating a sealed boundary that keeps engine oil inside the valvetrain cavity. When this gasket degrades, hardens, or cracks, oil begins to seep past the cover joint, leading to external leaks, oil consumption, and fouled surfaces on the engine and surrounding equipment. Replacing a failed head cover gasket with a properly fitted OEM unit restores the seal and stops oil loss before it can cause secondary damage or obscure other developing issues.
Part Details
| Part Number | 12391-ZA0-000 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Head Cover Gasket |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | EL5000, ES6500, EX5500 | All |
| Horizontal Shaft Engine | GX360 | 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.
