Honda 99101-124-0850 Main Jet (#85)

The Honda 99101-124-0850 Main Jet (#85) is a genuine OEM carburetor component designed for a wide range of Honda engines, generators, outboard motors, tillers, mowers, water pumps, and welder generators. This is a size #85 main jet — the number identifies the orifice calibration, and it is essential that this matches the original jet in your unit before ordering. As a direct OEM replacement, this part is manufactured to Honda's exact specifications, ensuring correct fuel delivery is restored without the need to recalibrate or adapt. Fitment spans an extensive lineup including GX240 and GXV270 horizontal and vertical shaft engines, WT20 and WT30 water pumps, BF75 and BF100 portable outboard motors, the FR700 tiller, the H1011 riding mower, the HS70 two-stage snow blower, E2500, E3500, EB3500, EG3500, EM3500, and EX3300 generators, the EW140 welder generator, the G300 horizontal shaft engine, and GXV340 vertical shaft engines.

Key Features

• Correct Fuel Metering — the #85 orifice size is calibrated to deliver the precise fuel-to-air ratio Honda specifies; the wrong jet size causes rich or lean running, hard starting, and power loss
• Genuine OEM Part — manufactured by Honda, ensuring the orifice diameter, thread pitch, and seat geometry match the original carburetor exactly
• Broad but Specific Fitment — listed for Honda engines, generators, outboard motors, water pumps, a tiller, a riding mower, a snow blower, and a welder generator; always confirm part number 99101-124-0850 against your unit's parts diagram before installing
• Serial Number Verification Recommended — Honda supersedes carburetor jets at production breaks across long-running models, so check your machine's serial number against the fitment table to confirm this is the correct jet for your specific unit
• Jet Size Match is Critical — this listing is for the #85 size only; if your original jet carries a different number, this part will not restore correct carburetion

The main jet is a small, precisely drilled orifice fitted inside the carburetor's fuel circuit. It meters the volume of fuel drawn into the air stream under normal running loads — too large an orifice floods the engine rich, too small starves it lean. When a main jet becomes clogged with varnish or debris from stale fuel, the engine loses power, runs roughly at mid-to-full throttle, or refuses to reach full speed. Replacing a blocked or damaged jet with a correctly sized OEM part restores the fuel calibration the carburetor was designed around, bringing the engine back to its original operating performance.

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.