The Honda 99101-ZH8-0550 Main Jet (#55) is a genuine OEM carburetor component designed for a wide range of Honda engines and equipment, including GX120 horizontal shaft engines, GXV120 and GXV140 vertical shaft engines, EG1400, EG2200, EG2500, EZ1400, and EZ2500 generators, WB20, WB30, WD20, and WD30 water pumps, WDP20 and WDP30 diaphragm water pumps, HR195, HR215, HRB215, HRM195, and HRM215 lawn mowers, and the HP400 power carrier. As a genuine Honda part, it carries the correct #55 orifice sizing to maintain the fuel-to-air ratio your carburetor was engineered to deliver. Confirm your unit's serial number against the fitment table before ordering, as Honda supersedes jets at production breaks, and this listing covers multiple models across several equipment classes.
Key Features
- Correct Orifice Sizing — the #55 calibration matches the original fuel-metering specification, maintaining the proper fuel-to-air ratio the carburetor depends on for consistent throttle response across the rev range
- Genuine Honda OEM Part — sourced directly from Honda, this jet is the same component installed at the factory and carries part number 99101-ZH8-0550 for confident cross-referencing
- Broad Equipment Coverage — listed for Honda generators, water pumps, diaphragm water pumps, lawn mowers, the HP400 power carrier, and both horizontal and vertical shaft engines, including the GX120, GXV120, and GXV140
- Check Your Serial Number — Honda updates carburetor jet specifications at serial number breaks; verify your machine's serial number against the fitment table to confirm this is the correct jet for your unit
The main jet is a precision-calibrated orifice inside the carburetor's fuel circuit. It controls the volume of fuel drawn into the airstream under normal running conditions, and its hole diameter — in this case #55 — is set to match the displacement and airflow characteristics of the engines and equipment it serves. When a main jet is worn, clogged, or replaced with an incorrectly sized unit, the engine will run too rich or too lean: symptoms include rough running, poor fuel economy, black exhaust smoke, or an engine that surges and refuses to hold a steady speed. Installing the correctly sized jet restores the fuel metering the carburetor was designed around and brings the engine back to its intended operating condition.
Part Details
| Part Number | 99101-ZH8-0550 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Main Jet (#55) |
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, HRB215, HRM195, HRM215 | All |
| Power Carrier | HP400 | All |
| Vertical Shaft Engine | GXV120, GXV140 | All |
| Water Pump | WB20, WB30, WD20, WD30 | 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.
