The Honda 99201-ZG8-1080 Main Jet Set (#108) is a genuine OEM component designed for GX610, GX620, GXV610, GXV620, HA4118, HA4120, HRC7018, and HRC7020 engines and equipment. As a direct Honda OEM part, this jet set is manufactured to the exact sizing and flow tolerances Honda specifies for the #108 main circuit. Confirm your serial number against the fitment table before ordering — Honda supersedes parts at serial breaks, and this listing covers a range of models across both horizontal and vertical shaft configurations as well as lawn tractors and commercial mowers.
Key Features
- Exact #108 Orifice Sizing — the jet is calibrated to Honda's specified flow rate for the main fuel circuit, ensuring the air-fuel mixture stays within the designed operating range under load
- Genuine Honda OEM — sourced directly from Honda, this set matches the original jet installed at the factory, eliminating the guesswork of cross-referencing aftermarket sizing charts
- Broad OEM Fitment — listed for GX610, GX620, GXV610, GXV620, HA4118, HA4120, HRC7018, and HRC7020; verify your serial number against the compatibility table to confirm the correct application for your unit
- Fuel Delivery Accuracy — a worn, clogged, or incorrectly sized main jet causes rich or lean running, hard starting, and power loss under load; replacing it with the correct #108 jet restores proper fuel metering throughout the mid-to-full throttle range
The main jet is the precision-metered orifice inside the carburetor that controls how much fuel enters the engine's air stream at mid and full throttle. Its calibrated bore size — in this case #108 — determines the fuel-to-air ratio the engine runs on under load, directly affecting power output, fuel efficiency, and engine temperature. When a main jet becomes clogged with deposits or worn oversized, the engine will run rough, surge, lose power, or produce excessive exhaust smoke; installing a fresh, correctly sized jet restores clean, consistent combustion across the operating range.
Part Details
| Part Number | 99201-ZG8-1080 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Main Jet Set (#108) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Commercial Mower | HRC7018, HRC7020 | All |
| 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.
