The Honda 99201-ZG8-1100 Main Jet Set (#110) is a genuine OEM fuel metering component designed for GX610, GX620, GXV610, GXV620, HA4118, and HA4120 engines and lawn tractors. As a direct Honda OEM part, this jet set carries the correct #110 sizing that Honda engineers specified for these engines, ensuring the carburetor delivers the right air-fuel ratio at full load. Confirm your serial number against the fitment table before ordering, as Honda updates jet specifications at production breaks.
Key Features
- Correct Fuel Metering — the #110 orifice size is Honda's specified calibration for these engines; an incorrect jet causes rich or lean running, power loss, and excessive fuel consumption
- Genuine OEM Part — sourced directly from Honda, this set matches the original jet geometry and orifice tolerance the carburetor was built around
- Broad Fitment — listed for GX610 and GX620 horizontal shaft engines, GXV610 and GXV620 vertical shaft engines, and HA4118 and HA4120 lawn tractors; verify your serial number against the compatibility table to confirm the correct jet for your build
- Restored Throttle Response — a worn or partially blocked main jet starves the engine at mid-to-high throttle; replacing it with a correctly sized OEM jet restores clean acceleration and steady full-load output
The main jet is the precision metering orifice inside the carburetor that controls how much fuel enters the engine under load. Its calibrated bore size determines the fuel-to-air mixture at mid-range and wide-open throttle; even a small deviation in orifice diameter shifts the mixture lean or rich, causing hesitation, overheating, or black smoke. Over time, varnish deposits from stale fuel can partially block the jet, robbing the engine of power and smooth response — cleaning or replacing the main jet with a correctly sized unit is a fundamental step in any carburetor service.
Part Details
| Part Number | 99201-ZG8-1100 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Main Jet Set (#110) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX610, GX620 | All |
| Lawn Tractor | HA4118, HA4120 | All |
| Vertical Shaft Engine | GXV610, GXV620 | 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.
