The Honda 99101-ZF5-1000 Main Jet (#100) is a genuine OEM component designed for EB6500 generators and GX390 horizontal shaft engines. As a direct OEM replacement, this main jet is manufactured to Honda's exact sizing, ensuring the correct fuel metering your carburetor depends on. Confirm your unit's serial number against the fitment table before ordering, as Honda supersedes carburetor components at specific serial breaks.
Key Features
- Correct Fuel Metering — the #100 orifice size is precision-calibrated to deliver the right air-fuel ratio for stable power output; an incorrect jet size causes rich or lean running, rough idling, and poor throttle response
- Genuine OEM Part — sourced directly from Honda, this jet matches the original specification installed at the factory, with no re-drilling or resizing required
- Broad GX and Generator Fitment — listed for GX390 horizontal shaft engines and EB6500 generators; check your serial number against the compatibility table to confirm this is the correct jet for your unit
- Critical Carburetor Consumable — main jets are subject to clogging from varnish and fuel deposits over time; replacing a fouled or damaged jet restores proper fuel delivery and full engine performance
The main jet is the primary fuel-metering component inside the carburetor. It is a precisely sized orifice that controls how much fuel enters the air stream at mid to full throttle, and the number stamped on it — in this case #100 — identifies that orifice diameter exactly. When a main jet becomes clogged with varnish or fuel deposits, the engine runs lean, loses power, and may surge or stall under load. Replacing it with the correct Honda OEM jet restores accurate fuel delivery and smooth, consistent operation across the full throttle range.
Part Details
| Part Number | 99101-ZF5-1000 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Main Jet (#100) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | EB6500 | All |
| Horizontal Shaft Engine | GX390 | 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.
