The Honda 99101-124-0980 Main Jet (#98) is a genuine OEM carburetor component designed for a wide range of Honda generators, engines, tractors, and welder generators. This is a size #98 main jet, and because Honda lists multiple jet sizes across overlapping model ranges, confirm that #98 matches the specification of your unit before ordering. As a genuine OEM part, it is manufactured to the same standards as the original, ensuring the correct fuel metering characteristics your carburetor was designed around. This Main Jet (#98) is listed for Honda equipment including the GX340 horizontal shaft engine, G400 horizontal shaft engine, GV400 vertical shaft engine, EB4000, EB5000, EG5000, EL5000, EM4000, EM5000, EMS4000, EMS4500, ES3500, ES6500, EX4500, EV4010, EV6010, EVD4010, EW170, EW171, EXW171 generators and welder generators, and the H5013, HT3810, and RT5000 tractors.
Key Features
- Correct Fuel Metering — a main jet calibrated to the #98 orifice size governs the primary fuel flow through the carburetor; the wrong size causes rich or lean running, rough idle, and power loss
- Genuine OEM Construction — manufactured by Honda to the same specification as the original jet, so the orifice diameter is exact and thread engagement is correct
- Broad Application Coverage — listed for Honda GX340 and G400 horizontal shaft engines, GV400 vertical shaft engines, multiple EB, EM, EG, EL, EMS, ES, EX, EV, and EW-series generators and welder generators, and H5013, HT3810, and RT5000 tractors
- Verify Your Jet Size — Honda carburetors are calibrated at specific serial breaks and may use a different jet size even within the same model; check your serial number against the fitment table and confirm #98 is the correct specification for your unit
The main jet is the primary metering component inside the carburetor's fuel circuit. It is a precisely drilled brass fitting through which fuel is drawn into the venturi and mixed with incoming air before combustion. The diameter of the orifice — in this case sized #98 — determines how much fuel the engine receives under load, directly affecting power output, fuel economy, and exhaust quality. When a main jet becomes clogged, corroded, or is replaced with the wrong size, the engine will run roughly, surge under load, consume excess fuel, or fail to reach full power.
Part Details
| Part Number | 99101-124-0980 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Main Jet (#98) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | EB4000, EB5000, EG5000, EL5000, EM4000, EM5000, EMS4000, EMS4500, ES3500, ES6500, EX4500 | All |
| Horizontal Shaft Engine | G400, GX340 | All |
| Lawn Tractor | HT3810 | All |
| Multi-Purpose Tractor | H5013, RT5000 | All |
| RV Generator | EV4010, EV6010, EVD4010 | All |
| Vertical Shaft Engine | GV400 | All |
| Welder Generator | EW170, EW171, EXW171 | 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.
