The Honda 12251-Z8S-801 Cylinder Head Gasket is a genuine OEM component designed for GX240 horizontal shaft engines. As a direct Honda OEM part, it is manufactured to the exact material grade and dimensional tolerances required for a proper combustion seal between the cylinder head and engine block. This gasket ensures the clamping retention and sealing integrity that the GX240 engine depends on to maintain compression and prevent coolant or oil migration. Buyers should verify their engine's serial number against the fitment table before ordering, as Honda supersedes parts at serial breaks.
Key Features
- OEM Combustion Sealing — Genuine Honda construction delivers the clamping retention and compression integrity this gasket must maintain under repeated heat cycling in GX240 engines.
- Exact-Fit Replacement — Made to Honda's precise dimensional specifications, this Cylinder Head Gasket installs directly in place of the original with no trimming or adjustment.
- GX240 Fitment — Designed specifically for GX240 horizontal shaft engines; confirm your serial number against the fitment table to ensure this is the correct version for your unit.
- Compression and Oil Control — A failed or degraded head gasket allows combustion gases to escape or oil to migrate past the sealing surface, leading to power loss, overheating, and internal contamination. This OEM replacement restores the barrier your engine relies on.
The cylinder head gasket forms the critical seal between the cylinder head and the engine block, containing combustion pressure and preventing oil or gases from escaping the combustion chamber. In a GX240 horizontal shaft engine, it endures extreme temperature swings and clamping loads every time the engine runs. When a head gasket fails — whether through age, improper torquing, or overheating — the engine loses compression, may consume oil, or produce visible exhaust smoke, making timely replacement with a genuine Honda part essential to restoring full engine performance.
Part Details
| Part Number | 12251-Z8S-801 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Cylinder Head Gasket |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX240 | 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.
