The Honda 12391-ZA0-800 Head Cover Gasket is a genuine OEM replacement designed for GX360 horizontal shaft engines, EV4010, EV6010, and EVD4010 RV generators, and H4013, H4514, H4518, HT3810, HT3813, and HT4213 lawn tractors. As a Honda OEM part, it is manufactured to the same specification as the original, ensuring a correct seal without rework or modification. Always verify the serial number on your machine against the fitment table, as Honda supersedes parts at production breaks and the correct gasket depends on your unit's build date.
Key Features
- OEM Sealing Integrity — manufactured by Honda to the original head cover specification, delivering the clamping and compression retention that aftermarket gaskets may not match
- Exact-Fit Replacement — an OEM Honda part that installs directly in place of the original head cover gasket, with no trimming or adjustment needed
- Broad Fitment — covers GX360 engines, EV4010, EV6010, and EVD4010 RV generators, and H4013, H4514, H4518, HT3810, HT3813, and HT4213 lawn tractors; confirm your serial number before ordering
- Protects Against Oil Leaks — a correctly seated head cover gasket prevents oil from escaping at the valve cover joint; a failed or compressed gasket leads to oil seepage, contamination, and the risk of low oil levels going unnoticed
The head cover gasket seals the joint between the valve cover and the cylinder head, keeping engine oil contained within the top end of the engine. It must maintain a consistent seal under repeated heat cycling as the engine warms up and cools down. When this gasket deteriorates, hardens, or is compressed beyond its service limit, oil begins to leak at the cover seam — creating mess, accelerating oil consumption, and potentially masking a developing low-oil condition. Replacing it with a genuine Honda part restores that seal and protects the valve train from contamination and the environment from oil drips.
Part Details
| Part Number | 12391-ZA0-800 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Head Cover Gasket |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX360 | All |
| Lawn Tractor | H4013, H4514, H4518, HT3810, HT3813, HT4213 | All |
| RV Generator | EV4010, EV6010, EVD4010 | 1000001-1270384 |
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.
