The Honda 99201-ZG8-0850 Main Jet Set (#85) is a genuine OEM component designed for GX610 horizontal shaft engines. As a direct Honda OEM part, this jet set carries the correct #85 sizing to deliver accurate fuel metering right out of the box. This part is built to Honda's original specification, ensuring a drop-in fit for the GX610 without guesswork on jetting size. Confirm your engine's serial number against the fitment table before ordering to ensure this is the right jet for your unit.
Key Features
- Correct Fuel Metering — the #85 jet size is calibrated to Honda's original fuel delivery specification for the GX610, so the engine receives precisely the right air-fuel mixture across its operating range
- Genuine OEM Part — sourced directly from Honda, this Main Jet Set carries the exact orifice diameter that left the factory, eliminating the tuning uncertainty that comes with improperly sized jets
- GX610 Fitment — listed for GX610 horizontal shaft engines; verify your serial number against the compatibility table to confirm this is the correct jet for your engine's carburetor
- Engine Performance — a worn, clogged, or incorrectly sized main jet causes rich or lean running, hard starting, and power loss; replacing it with the correct #85 unit restores clean throttle response and steady power output
The main jet is the primary metering orifice inside the carburetor's fuel circuit. Its calibrated hole size controls how much fuel is drawn into the airstream at mid to high throttle, directly governing the air-fuel mixture and, in turn, combustion efficiency. When the main jet becomes clogged with varnish deposits or worn oversize, the engine runs rough, loses power, or refuses to reach full speed. Fitting the correct Honda OEM replacement — sized to the original #85 specification — restores the fuel delivery balance the GX610 engine was designed to run on.
Part Details
| Part Number | 99201-ZG8-0850 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Main Jet Set (#85) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Horizontal Shaft Engine | GX610 | 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.
