The Honda 18325-ZB4-000 Muffler Inner Protector is a genuine OEM component built for GX240, GX270, GX340, and GX390 horizontal shaft engines, as well as EB3500, EB5000, EB6500, EM3500, EM5000, EM6000, EW140, and EW171 generators and welder generators. As a direct Honda OEM replacement, this protector is manufactured to the same specification as the part it replaces, ensuring a proper fit with no guesswork. Confirm your machine's serial number against the fitment table before ordering, as Honda does supersede parts at serial breaks across this range.
Key Features
- Genuine Honda OEM Part — sourced directly from Honda, this protector matches the original in geometry and material, so it seats correctly against the muffler assembly the first time.
- Broad Fitment Across Engines and Generators — covers GX240, GX270, GX340, and GX390 horizontal shaft engines, including EB3500, EB5000, EB6500, EM3500, EM5000, EM6000, EW140, and EW171 generators and welder generators.
- Serial Number Verification Recommended — Honda updates parts at production breaks; check your unit's serial number against the compatibility table to confirm part number 18325-ZB4-000 is correct for your specific machine.
- Heat Management at the Muffler — a damaged or missing inner protector exposes surrounding components to elevated muffler temperatures; replacing it promptly keeps heat directed away from sensitive areas of the machine.
The Muffler Inner Protector is a heat shield positioned on the interior face of the muffler guard assembly. It sits between the hot muffler body and adjacent components, channeling exhaust heat away from areas of the engine or generator enclosure that are not designed to tolerate sustained high temperatures. When this protector cracks, warps, or goes missing, nearby components can be exposed to heat levels that accelerate wear or cause damage over time — making timely replacement an important part of routine exhaust system maintenance.
Part Details
| Part Number | 18325-ZB4-000 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Muffler Inner Protector |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | EB3500, EB5000, EB6500, EM3500, EM5000, EM6000 | All |
| Horizontal Shaft Engine | GX240, GX270, GX340, GX390 | All |
| Welder Generator | EW140, EW171 | 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.
