The Honda 18310-Z4M-811 Muffler (Arrester) is a genuine OEM replacement built for GX120 and GX160 horizontal shaft engines, WB20, WB30, WH15, WH20, WMP20, and WT20 water pumps, WDP20 and WDP30 diaphragm water pumps, and the FC600 tiller. As a direct Honda OEM component, this muffler with integrated spark arrester is manufactured to the same specification as the original, ensuring a proper fit and correct exhaust flow. Verify your machine's serial number against the fitment table before ordering, as Honda supersedes parts at specific serial breaks and more than one variant may be listed across this broad range of equipment.
Key Features
- Genuine OEM Exhaust Quality — manufactured by Honda to the original specification, maintaining correct back-pressure and exhaust tone for each engine and machine this muffler serves
- Integrated Spark Arrester — the built-in arrester screen traps and extinguishes exhaust sparks at the outlet, a feature required when operating equipment in dry or restricted environments
- Direct-Fit Replacement — engineered to bolt up to the exhaust port without cutting, drilling, or adapting, using the same mounting geometry as the original muffler
- Broad Equipment Compatibility — covers GX120 and GX160 horizontal shaft engines, WB20, WB30, WH15, WH20, WMP20, and WT20 water pumps, WDP20 and WDP30 diaphragm water pumps, and the FC600 tiller; confirm your model and serial number before ordering
- Restored Exhaust Performance — a cracked, corroded, or damaged muffler lets raw exhaust gases escape before they are properly routed, increasing noise and reducing engine efficiency; this replacement restores proper exhaust handling
The muffler manages the flow of hot exhaust gases away from the engine, reducing combustion noise to an acceptable level while channeling spent gases safely out of the unit. The integrated spark arrester adds a secondary function: a fine metal screen at the exhaust outlet catches hot carbon particles before they can exit, which matters most when the equipment is used in dry fields, near dry vegetation, or in any setting where an open spark is a concern. When a muffler cracks, corrodes through, or loses its arrester screen, exhaust noise rises sharply, the engine may lose back-pressure efficiency, and the arresting function is compromised — all signs that replacement is overdue.
Part Details
| Part Number | 18310-Z4M-811 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Muffler (Arrester) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Diaphragm Water Pump | WDP20, WDP30 | All |
| Horizontal Shaft Engine | GX120, GX160 | All |
| Tiller | FC600 | All |
| Water Pump | WB20, WB30, WH15, WH20, WMP20, WT20 | 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.
