The Honda 99101-ZH7-0780 Main Jet (#78) is a genuine OEM component designed for a range of Honda portable outboard motors, generators, and horizontal shaft engines, including the BF5, BF50, EB3500, EG3500, EM3500, EX3300, GX200, and GX240. As an authentic Honda part, it is manufactured to the exact specifications required for correct fuel metering in each application it covers. Confirm your model and serial number against the fitment table before ordering, as Honda supersedes jet sizes at serial breaks and listing coverage varies by production range.
Key Features
- Exact Fuel Metering — the #78 sizing is calibrated to deliver the precise fuel flow rate Honda specifies for each covered application; an incorrectly sized jet causes rich or lean running, hard starting, and power loss
- Genuine OEM Part — sourced directly from Honda, this jet matches the original in orifice diameter and thread form, so it drops into the carburettor body without rework or adaptation
- Broad Application Coverage — listed for BF5 portable outboard motors, BF50 outboard motors, EB3500, EG3500, EM3500, and EX3300 generators, and GX200 and GX240 horizontal shaft engines
- Verify Before Ordering — Honda assigns jet sizes by serial number range; check your unit's serial number against the fitment table to confirm part number 99101-ZH7-0780 is correct for your specific machine
The main jet is the fixed orifice inside the carburettor that meters the volume of fuel drawn into the engine under load. Its bore diameter — in this case the #78 size — determines how much fuel mixes with incoming air to form the combustion charge, directly setting the air-fuel ratio at wide-open throttle. A jet that is blocked, eroded, or of the wrong size causes the engine to run lean and overheat, or rich and sooty, robbing it of power and making clean, steady operation impossible.
Part Details
| Part Number | 99101-ZH7-0780 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Main Jet (#78) |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | EB3500, EG3500, EM3500, EX3300 | All |
| Horizontal Shaft Engine | GX200, GX240 | All |
| Outboard Motor | BF50 | All |
| Portable Outboard Motor | BF5 | 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.
