The Honda 12361-888-000 Tappet Room Cover is a genuine OEM replacement designed for GV150 vertical shaft engines, HR21 lawn mowers, and HRA21 lawn mowers. As an authentic Honda part, it is manufactured to the same tolerances as the original, ensuring a proper seal over the valve train area. This cover is the correct replacement for all models listed in the fitment table — confirm your serial number against the fitment data before ordering, as Honda supersedes parts at serial breaks.
Key Features
- Genuine OEM Sealing Integrity — manufactured by Honda to seal the tappet room and prevent oil contamination and external leakage at the valve train access point
- Direct OEM Replacement — this part drops in as a direct replacement for the original cover, restoring the correct fit and closure on the valve train enclosure
- Broad Fitment — covers GV150 vertical shaft engines as well as HR21 and HRA21 lawn mowers; verify your unit's serial number against the fitment table to confirm the correct application
- Protects Valve Train Operation — a failed or cracked tappet room cover allows oil to escape and contaminants to enter, accelerating wear on the valves and tappets and leading to loss of engine performance
The Tappet Room Cover encloses the tappet chamber — the area of the engine where the valves, tappets, and associated valve train components operate. By sealing this chamber, the cover keeps engine oil where it belongs and blocks dirt, debris, and moisture from reaching the valve train. When this cover cracks, warps, or loses its seal, oil leaks develop and the valve train becomes vulnerable to contamination, leading to accelerated wear, improper valve clearance, and reduced engine performance over time.
Part Details
| Part Number | 12361-888-000 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Tappet Room Cover |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Lawn Mower | HR21, HRA21 | All |
| Vertical Shaft Engine | GV150 | 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.
