The Honda 12311-Z6L-800 Cylinder Head Cover is a genuine OEM replacement designed for GX630, GX660, GX690, GX700, and GX800 horizontal shaft engines, as well as the EB10000 generator. As a direct Honda OEM component, this cover is manufactured to the exact specifications of the original part it replaces, ensuring a correct fit without the guesswork that comes with non-OEM alternatives. Verify your engine's serial number against the fitment table before ordering, as Honda periodically supersedes parts at production breaks across these large-displacement engine families.
Key Features
- Genuine Honda OEM Part — manufactured to Honda's original specifications, ensuring the correct gasket seating surface geometry and valve-train clearance that large-displacement GX-series engines demand
- Exact-Fit Replacement — designed to drop directly onto GX630, GX660, GX690, GX700, and GX800 horizontal shaft engines and the EB10000 generator using the original mounting points and hardware
- Wide Fitment Coverage — a single part number covers Honda's top-tier commercial engine lineup, including the GX630, GX660, GX690, GX700, GX800, and the EB10000 generator; confirm your serial number to ensure the correct supersession revision
- Valve-Train Protection — a properly seated cylinder head cover maintains the oil-tight enclosure that keeps the valve train lubricated and protected from contamination; a cracked or warped cover leads to oil leaks and accelerated valve-train wear
The cylinder head cover seals the top of the engine's cylinder head, enclosing the valve train — the rocker arms, valves, and associated hardware that control airflow into and out of the combustion chamber. By keeping that area sealed, the cover retains the oil mist that lubricates the rocker arms and prevents dirt and debris from entering a precision area of the engine. When the cover cracks, warps, or its gasket surface deteriorates, oil seeps onto the engine exterior, valve-train components run dry, and contaminants can work their way in — all of which accelerate wear and can lead to costly engine damage if left unaddressed.
Part Details
| Part Number | 12311-Z6L-800 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Cylinder Head Cover |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | EB10000 | All |
| Horizontal Shaft Engine | GX630, GX660, GX690, GX700, GX800 | 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.
