The Honda 18310-Z4M-010 Muffler is a genuine OEM replacement designed for a wide range of Honda engines and power equipment, including 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 OEM part, this muffler is built to Honda's exact specifications, ensuring it installs correctly and performs as intended on every compatible unit. Always verify your machine's model and serial number against the fitment table before ordering, as Honda supersedes parts at serial breaks and multiple variants may apply.
Key Features
- Genuine OEM Exhaust Engineering — manufactured to Honda's exact back-pressure and exhaust-flow specifications, maintaining the combustion efficiency the engine was designed to deliver
- Broad Compatibility — fits 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, including a wide range of serial ranges across these models
- Direct OEM Replacement — drops into the existing exhaust port mounting position with no cutting, drilling, or adapting required, restoring the original exhaust routing and clearances
- Serial Number Verification Recommended — Honda revises muffler part numbers across production runs; confirm your unit's serial number against the fitment table to ensure this is the correct muffler for your machine
- Restored Exhaust Performance — a cracked, corroded, or failed muffler allows uncontrolled exhaust discharge and degrades engine performance; this replacement restores proper exhaust scavenging and noise attenuation
The muffler is the final stage of an engine's exhaust system. Hot combustion gases exit the cylinder head and pass through the muffler, which uses internal chambers and baffles to reduce exhaust noise while allowing spent gases to escape freely. A correctly functioning muffler maintains the back-pressure balance the engine was tuned for, supporting efficient combustion and steady power output. When a muffler cracks, corrodes, or becomes blocked, exhaust flow is disrupted — leading to reduced power, rough running, and uncontrolled exhaust noise that makes the machine difficult to operate.
Part Details
| Part Number | 18310-Z4M-010 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Muffler |
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.
