The Honda 99101-124-1050 Main Jet (#105) is a genuine OEM carburetor jet designed for GV400 vertical shaft engines, GX340 horizontal shaft engines, and H5013 and RT5000 multi-purpose tractors. As a Honda OEM component, this jet is manufactured to the exact size and flow specification Honda requires for correct fuel metering in the carburetor. Confirm part number 99101-124-1050 against your machine's serial number and model type before ordering, as Honda supersedes jets at serial breaks and more than one jet size may be listed for a given model family.
Key Features
- Exact Fuel Metering — OEM-spec #105 calibration ensures the carburetor delivers the correct air-fuel ratio, preserving throttle response and fuel efficiency across the power range.
- Direct OEM Replacement — manufactured by Honda to fit the carburetor bore without modification; this jet threads in to the same seat as the original.
- Broad Fitment — listed for GV400 vertical shaft engines, GX340 horizontal shaft engines, and H5013 and RT5000 multi-purpose tractors; always cross-reference your serial number against the fitment table to confirm the correct jet size for your unit.
- Performance Impact — a clogged, worn, or incorrect main jet causes rich or lean running, hard starting, and power loss; replacing it with the correct OEM jet restores clean, stable combustion.
The main jet is the precision metering orifice inside the carburetor that controls how much fuel is drawn into the engine under load. Its calibrated bore size — #105 in this case — determines the fuel flow rate at mid to wide-open throttle; even a small deviation from the specified size disrupts the air-fuel mixture and affects power output, fuel consumption, and exhaust emissions. When a main jet becomes blocked with varnish or debris, or is replaced with an incorrect size, the engine will typically run lean and overheat or run rich and foul the spark plug, making a correctly sized OEM jet one of the most performance-critical small components in the fuel system.
Part Details
| Part Number | 99101-124-1050 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Main Jet (#105) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX340 | All |
| Multi-Purpose Tractor | H5013, RT5000 | 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.
