The Honda 99102-ZM3-0340 Jet (#34.5) is a genuine OEM carburetor main jet designed for GX22 and GX31 horizontal shaft engines, the HHE31 stick edger, HHT31 trimmer, UMK422 and UMK431 trimmers, and WX10 water pumps. As a direct OEM replacement, this jet is manufactured to Honda's exact specifications, ensuring the correct orifice sizing that governs fuel delivery through the carburetor. Confirm the #34.5 sizing and your engine or equipment serial number against the fitment table before ordering, as Honda supersedes carburetor components at serial breaks.
Key Features
- Correct Orifice Calibration — the #34.5 designation is the fuel metering orifice size; an incorrect jet size throws off the air-fuel ratio and causes rough running, poor throttle response, or hard starting
- Genuine OEM Part — sourced directly from Honda, this jet matches the original specification for fuel flow rate and orifice geometry, replacing the worn or damaged original with confidence
- Broad Fitment — listed for GX22 and GX31 horizontal shaft engines, the WX10 water pump, and HHE31, HHT31, UMK422, and UMK431 trimmers and edgers; use the fitment table to confirm your specific unit
- Serial Number Verification Recommended — Honda updates carburetor jet specifications at production serial breaks, so always check your machine's serial number against the fitment table to confirm part number 99102-ZM3-0340 is correct for your unit
A carburetor main jet is a precisely sized brass orifice that meters the volume of fuel drawn into the engine's air stream during normal running operation. The orifice diameter — identified here as #34.5 — is calibrated to the engine's displacement and carburetor design, and it controls the richness or leanness of the fuel mixture under load. When a jet becomes clogged with varnish deposits or is physically damaged, the engine will run lean, surge, lose power, or fail to sustain a stable idle, and cleaning or replacing it is a standard step in carburetor service.
Part Details
| Part Number | 99102-ZM3-0340 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Jet (#34.5) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX22, GX31 | All |
| Stick Edger | HHE31 | 1432193-9999999 |
| Trimmer | HHT31, UMK422, UMK431 | All |
| Water Pump | WX10 | 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.
