The Honda 18310-Z8T-010 Muffler is a genuine OEM component designed for GX340 and GX390 horizontal shaft engines. As a factory-sourced part, it meets Honda's original design specifications for exhaust flow and noise attenuation — the same standards built into these engines from the factory. This muffler is a direct OEM replacement for GX340 and GX390 engines, and buyers should confirm their engine serial number against the fitment table, as Honda updates parts at serial breaks. Part number 18310-Z8T-010 appears on Honda's official parts list for these engines, so cross-checking before ordering is always the right move.
Key Features
- Genuine OEM Exhaust Component — sourced directly from Honda, this muffler matches the original exhaust outlet dimensions and mounting configuration of the GX340 and GX390 engines, ensuring proper backpressure and combustion efficiency.
- Correct Exhaust Flow — engineered to Honda's original flow specifications, this muffler helps maintain the power output and fuel efficiency the GX340 and GX390 are rated for; a cracked or deteriorated muffler disrupts exhaust scavenging and can noticeably reduce engine performance.
- GX340 and GX390 Fitment — designed specifically for GX340 and GX390 horizontal shaft engines. Verify your engine serial number against the fitment table before ordering, as this part may apply to specific serial ranges within these models.
- Exhaust Noise Control — a failed or damaged muffler causes excessive exhaust noise and can expose operators and bystanders to harmful exhaust levels; replacing a worn unit restores the engine's intended sound attenuation.
A muffler receives hot exhaust gases from the engine's exhaust port and reduces the pressure pulses that cause noise before releasing them to atmosphere. On horizontal shaft engines like the GX340 and GX390, the muffler also plays a role in managing exhaust backpressure, which directly affects how efficiently the engine breathes and how much usable power it produces. When a muffler cracks, corrodes, or loses its internal baffling, exhaust noise rises sharply, engine performance can drop, and carbon deposits may accumulate — all signs that the muffler has reached the end of its service life and should be replaced.
Part Details
| Part Number | 18310-Z8T-010 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Muffler |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX340, GX390 | 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.
