The Honda 12391-ZG9-800 Head Cover Gasket is a genuine OEM replacement designed for GXV140 vertical shaft engines and a wide range of Honda lawn mowers, including the HR195, HR215, HRA215, HRB215, HRC215, HRC216, HRM195, and HRM215. As a factory-sourced component, this gasket meets Honda's own specifications for sealing performance and dimensional accuracy. Confirm your machine's serial number against the fitment table before ordering, as Honda supersedes parts at serial breaks and the correct version depends on your unit's production range.
Key Features
- Genuine OEM Sealing Integrity — sourced directly from Honda, this gasket is manufactured to the same specification as the original, delivering consistent head cover sealing for GXV140-based equipment.
- Direct-Fit Replacement — designed as a drop-in replacement for the original gasket, this part installs without modification using the original fasteners and torque procedure.
- Broad Lawn Mower Coverage — fits the HR195, HR215, HRA215, HRB215, HRC215, HRC216, HRM195, and HRM215 lawn mowers, as well as the GXV140 vertical shaft engine.
- Serial Number Verification Recommended — Honda updates part numbers at production breaks, so cross-check your machine's serial number against the fitment table to confirm part number 12391-ZG9-800 is correct for your unit.
- Prevents Oil Leaks — a compromised or aging head cover gasket allows oil to seep past the valve cover joint, leading to external oil loss and potential contamination of the air filter and surrounding components.
The head cover gasket forms the seal between the valve cover and the cylinder head, closing off the upper end of the engine where the valvetrain operates. It prevents engine oil from escaping at that joint during operation. When this gasket deteriorates, cracks, or is crushed from overtightening, oil begins to leak externally — often visible as residue along the top of the engine — and left unaddressed, continued oil loss can lead to low oil levels and accelerated internal wear. Replacing a failed gasket with a correctly fitted OEM part restores the seal and keeps oil where it belongs.
Part Details
| Part Number | 12391-ZG9-800 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Head Cover Gasket |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Lawn Mower | HR195, HR215, HRA215, HRB215, HRC215, HRC216, HRM195, HRM215 | All |
| Vertical Shaft Engine | GXV140 | 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.
