The Honda 99101-124-1000 Main Jet (#100) is a genuine OEM carburetor component designed for a wide range of Honda engines and equipment, including GX340 horizontal shaft engines, GV400 vertical shaft engines, G400 horizontal shaft engines, EL5000 and ES6500 generators, EV4010, EV6010, and EVD4010 RV generators, H5013 and RT5000 multi-purpose tractors, and HT3810 lawn tractors. As a genuine Honda OEM part, this main jet is manufactured to the exact specification of the original, ensuring the correct fuel metering your carburetor depends on. Always confirm your unit's model and serial number against the fitment table before ordering, as Honda supersedes and updates carburetor components at specific production breaks.
Key Features
- Correct Fuel Metering — sized at #100, this jet delivers the precise fuel flow the carburetor was calibrated for, maintaining the proper air-fuel mixture across the engine's operating range
- Genuine Honda OEM — sourced directly from Honda, this jet matches the original specification exactly, with no guesswork on orifice sizing or fitment
- Broad Fitment — listed for GX340 and G400 horizontal shaft engines, GV400 vertical shaft engines, EL5000 and ES6500 generators, EV4010, EV6010, and EVD4010 RV generators, H5013 and RT5000 multi-purpose tractors, and the HT3810 lawn tractor — confirm your model before ordering
- Serial Number Verification Recommended — Honda updates carburetor jets at production breaks; check your machine's serial number against the fitment table to confirm this is the correct jet for your unit
- Restores Correct Combustion — a worn, clogged, or incorrectly sized main jet causes rich or lean running, hard starting, poor power output, and increased fuel consumption; replacing it with the correct OEM part brings combustion back into spec
The main jet is a small precision-machined orifice inside the carburetor's main circuit that meters the volume of fuel drawn into the air stream at cruising and full-throttle engine speeds. Its calibrated hole size — in this case #100 — is what determines how much fuel the engine receives under load, and even a small deviation in orifice diameter shifts the air-fuel mixture lean or rich. A clogged or damaged main jet starves the engine of fuel at load, causing hesitation, loss of power, and overheating; an oversized or incorrectly specified jet floods the mixture, fouling the spark plug and raising fuel consumption. Fitting the correct Honda OEM replacement restores the carburetor to its designed operating condition.
Part Details
| Part Number | 99101-124-1000 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Main Jet (#100) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | EL5000, ES6500 | 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 |
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.
