The Multiquip 99101ZH81050 is a genuine OEM Main Jet #105 GX390 designed for JWN24HTCSL/HSCSL series ride-on mechanical trowels. As a direct Multiquip OEM part, 99101ZH81050 delivers the exact fuel metering specification your GX390-powered trowel demands, ensuring the carburetor operates precisely as intended. Confirm your model code against your unit's serial plate before ordering — this jet is sized specifically for GX390-equipped JWN24HTCSL and HSCSL configurations.
Key Features
- Exact OEM Fuel Metering: — Drilled to the factory #105 orifice specification, delivering the precise air-fuel ratio the GX390 engine requires at full operating load.
- Direct Carburetor Drop-In: — Threads directly into the OEM carburetor body on GX390-powered units with no rejettig or adaptation needed.
- Confirmed Fitment: — Verified for JWN24HTCSL and JWN24HSCSL ride-on mechanical trowels equipped with the Honda GX390 gasoline engine.
- Prevents Rich or Lean Run Conditions: — A worn or incorrect main jet causes hard starting, rough idle, power loss, or excessive fuel consumption; the correct #105 jet restores clean combustion across the RPM range.
- Genuine Multiquip OEM Quality: — Manufactured to the same brass composition and orifice tolerance as the original, so calibration holds up through extended service cycles.
The main jet is the primary fuel metering component inside the carburetor float bowl. It controls the volume of fuel drawn into the engine during mid-range to wide-open throttle operation by restricting fuel flow through a precisely sized orifice — in this case, a #105 bore. When the jet becomes clogged with varnish or debris, or is worn oversize, the engine runs erratically, loses power, or refuses to reach full throttle. Replacing it with the correctly sized OEM jet restores clean, predictable combustion and protects the engine from the damage caused by sustained lean or rich running conditions.
Part Details
| Part Number | 99101ZH81050 |
|---|---|
| Brand | Multiquip |
| Part Type | Genuine OEM |
| Description | Main Jet #105 GX390 |
Compatibility & Fitment
| Name | Model |
|---|---|
| Whiteman Ride-On Power Trowels | JWN24HTCSL/HSCSL |
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.
