Description
Overview:
This genuine Honda rocker cover gasket (OEM 12312-Z0H-300) is a moulded, oil-resistant black rubber seal designed for small 4-stroke Honda engines such as the GX25 and GX25N. It sits between the rocker/valve cover and the cylinder head to create a tight, reliable seal, preventing oil leaks and keeping the valvetrain area clean. Built to Honda's standards, the gasket maintains compression around the cover perimeter and bolt holes after repeated heat cycles, helping the engine run cleanly and efficiently. It is a direct replacement for a worn, flattened, or brittle gasket and is suitable for handheld and compact machinery powered by Honda's mini 4-stroke engines, including brushcutters, hedge trimmers, and blowers used by tradespeople, grounds teams, and DIY users.
Key Features:
- Genuine Honda part for assured fit and compatibility
- OEM reference 12312-Z0H-300 for easy identification
- Moulded, oil-resistant rubber construction for durable sealing
- Accurate profile and bolt-hole alignment to prevent weeping and seepage
- Helps maintain engine efficiency by keeping oil inside the cover
- Resists hardening and shrinkage from heat and vibration
- Supports correct crankcase ventilation and reduces oil misting
- Straightforward installation with standard hand tools
- Suitable for routine maintenance and leak repairs on GX25-series engines
Typical Applications:
Used when servicing or repairing Honda mini 4-stroke engines after removing the rocker/valve cover, such as during valve clearance checks, cleaning, or leak diagnosis. Ideal for restoring an oil-tight seal on brushcutters, hedge trimmers, and blowers that use the GX25 family of engines to prevent oil loss and contamination.
Also known as:
Valve cover gasket, rocker cover seal, tappet cover gasket, cylinder head cover gasket, cam cover seal, engine top cover gasket.
Fits Models:
GX25, GX25N, GX25NT, GX25T, GX5T, HHB25E, HHH25S, HHH25S 75E, HHH25S75E, UMK 425, UMK 425 LE, UMK425, UMK425LE
Alternate Part Numbers:
12312Z0H300
Product Specifications
| L&S Part No. | 12312 Z0H 300 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Honda |
| OEM No. | 12312Z0H300 |
| Unit of Sale | 1 |
| Applications | GX25, GX25N, GX25NT, GX25T, GX5T, HHB25E, HHH25S, HHH25S 75E, HHH25S75E, UMK 425, UMK 425 LE, UMK425, UMK425LE |
| Machine Type | Engines |
| Fits Brands | Honda |
| Fits Models | GX25 (GCAAM) | GX25 (GCABK) | GX25 (GCABM) | GX25N (GCADK) | GX25T (GCALT) | GX25T (GCANT) | GX25T (GCAPT) | GX25NT (GCART) | HHB25E | HHH25S 75E | UMK 425 LE |
