The Honda 99101-ZK7-0580 Main Jet (#58) is a genuine OEM carburetor component designed for a wide range of Honda engines and power equipment, including GX120 horizontal shaft engines, GXV120 and GXV140 vertical shaft engines, EG and EZ-series generators, HR-series lawn mowers, WB, WD, WH, WP, and WDP-series water pumps, F401 and F501 tillers, and HP400 power carriers. As a genuine Honda part, this main jet carries the correct #58 sizing critical for proper fuel metering — the right jet number is not interchangeable with an adjacent size. Because Honda supersedes carburetor components at specific serial breaks, buyers should verify their machine's serial number against the fitment table before ordering to confirm part number 99101-ZK7-0580 is the correct specification for their unit.
Key Features
- Correct Fuel Metering — the #58 designation specifies the orifice size that controls main-circuit fuel flow; using the wrong jet number will cause rich or lean running across the operating RPM range
- Genuine OEM Part — sourced directly from Honda, ensuring the orifice diameter, thread pitch, and material match the original carburetor specification exactly
- Broad Fitment — listed for GX120 and GXV120/GXV140 engines, EG1400, EG2200, EG2500, EZ1400, EZ2500 generators, HR195, HR215, HRA215, HRB215, HRC215, HRC216, HRM215 lawn mowers, WB20, WB30, WD20, WD30, WH15, WH20, WP20, WP30 and WDP20/WDP30 water pumps, F401/F501 tillers, and the HP400 power carrier
- Serial Number Verification Recommended — Honda updates carburetor jets at production serial breaks, so confirm your machine's serial number against the fitment table to ensure this is the correct jet for your specific unit
The main jet is a precision-calibrated orifice inside the carburetor's main circuit that meters the volume of fuel delivered to the engine under mid-to-full throttle load. Its size — expressed as a number stamped on the jet body — is matched at the factory to the engine's displacement and carburetor design to achieve the correct air-fuel ratio for clean combustion and full power output. A blocked, corroded, or incorrectly sized main jet starves the engine of fuel at load, causing hesitation, power loss, or lean-running damage, while a jet that is too large will cause excessive fuel consumption, black exhaust smoke, and fouled spark plugs.
Part Details
| Part Number | 99101-ZK7-0580 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Main Jet (#58) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Diaphragm Water Pump | WDP20, WDP30 | All |
| Generator | EG1400, EG2200, EG2500, EZ1400, EZ2500 | All |
| Horizontal Shaft Engine | GX120 | All |
| Lawn Mower | HR195, HR215, HRA215, HRB215, HRC215, HRC216, HRM215 | All |
| Power Carrier | HP400 | All |
| Tiller | F401, F501 | All |
| Vertical Shaft Engine | GXV120, GXV140 | All |
| Water Pump | WB20, WB30, WD20, WD30, WH15, WH20, WP20, WP30 | 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.
