The Honda 99101-ZF5-0550 Main Jet (#55) is a genuine OEM carburetor component designed for a wide range of Honda engines, generators, lawn mowers, and water pumps, including GX120 horizontal shaft engines, EG1400, EG2200, and EG2500 generators, HRB215 and HRM215 lawn mowers, and WB20, WB30, WD20, and WD30 water pumps. As a genuine Honda part, this main jet is manufactured to the exact sizing and flow specification the factory carburetor requires, with no guesswork on calibration. The #55 designation identifies the jet's orifice size — verify that your machine's carburetor calls for this sizing before ordering, as Honda lists multiple jet sizes across its equipment range.
Key Features
- Exact Fuel Metering — the #55 orifice is precision-sized to deliver the correct air-fuel ratio for the carburetors this jet is catalogued for; an incorrect size causes rich or lean running and power loss
- Genuine OEM Part — manufactured by Honda to the same specification as the original, ensuring the jet seats and seals correctly within the carburetor body without modification
- Broad Fitment — listed for GX120 engines, EG-series generators, HRB215 and HRM215 lawn mowers, and WB/WD-series water pumps, covering a wide range of Honda equipment
- Verify Your Serial Number — Honda supersedes carburetor jets at production breaks; check the serial number on your machine against the fitment table to confirm part number 99101-ZF5-0550 is correct for your unit
The main jet is a small, precisely drilled orifice installed inside the carburetor's fuel circuit. It controls how much fuel enters the engine under load — too large an opening richens the mixture and causes fouling and excess fuel consumption; too small a hole leans the mixture and leads to overheating and power loss. When a main jet becomes clogged with deposits or varnish from stale fuel, the engine will typically run weakly under load or stall when brought up to working speed. Replacing a worn or blocked jet with the correct Honda OEM piece restores proper fuel delivery and brings the engine back to its rated output.
Part Details
| Part Number | 99101-ZF5-0550 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Main Jet (#55) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | EG1400, EG2200, EG2500 | All |
| Horizontal Shaft Engine | GX120 | All |
| Lawn Mower | HRB215, HRM215 | 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.
