Honda 99101-ZH8-1020 Main Jet (#102)

The Honda 99101-ZH8-1020 Main Jet (#102) is a genuine OEM carburetor jet designed for a wide range of Honda engines and equipment, including GX270, GX340, GX390, GX440, GX630, GX660, GX670, and GX690 horizontal shaft engines, GXV630, GXV660, GXV670, and GXV690 vertical shaft engines, EB and EG and EM series generators, HS and HSS and HSM two-stage snow blowers, the WT40 water pump, the FRC800 tiller, and H5013 and RT5000 multi-purpose tractors. As a genuine Honda OEM part, this jet carries the exact size designation — #102 — that Honda specifies for the carburetors it serves, ensuring the fuel metering your engine depends on is correct from the first start. Because Honda supersedes carburetor jets across serial breaks, always verify your machine's serial number against the fitment table before ordering to confirm this is the right jet for your unit.

Key Features

• Exact Fuel Metering — as a genuine OEM jet, the #102 orifice size is calibrated to Honda's specification, delivering the correct air-fuel ratio for clean combustion and consistent power output across all listed engines and equipment
• Direct Carburetor Replacement — this jet is sized and threaded to Honda's OEM dimensions, allowing it to seat correctly in the carburetor without modification
• Broad Genuine OEM Coverage — listed for Honda GX-series and GXV-series engines, EB, EG, and EM generators, HSS and HSM snow blowers, the WT40 water pump, the FRC800 tiller, H5013 and RT5000 tractors, and more; use the fitment table to match your model
• Serial Number Verification Recommended — Honda updates carburetor jets at production breaks, so confirm your machine's serial number in the fitment table before ordering to ensure this is the correct supersession for your unit
• Restore Correct Running Condition — a worn, clogged, or incorrect main jet causes rich or lean running, poor throttle response, and hard starting; replacing it with the correctly sized OEM jet restores stable, responsive engine performance

The main jet is the primary fuel-metering component inside the carburetor's main circuit. It is a precisely sized brass orifice that controls how much fuel enters the venturi under mid-to-full throttle conditions — get the size wrong and the engine will run too rich, too lean, or refuse to reach full power. Over time, jets can become partially blocked by varnish deposits from stale fuel or damaged by aggressive cleaning, disrupting fuel flow and causing erratic running, black smoke, or poor load response. Replacing a compromised jet with a genuine Honda #102 main jet restores the carburetor's ability to meter fuel exactly as designed, bringing the engine back to its intended power and efficiency.

Part Details

Compatibility & Fitment

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.