Replace a worn or damaged needle jet on your QMB139 50cc 4-stroke scooter with this Universal Parts Adjustable Needle Jet. This stainless steel needle jet features a tapered tip, cylindrical body, and 5 adjustment grooves for fine-tuning the air/fuel mixture across the throttle range. Includes a C-clip pre-installed in the middle (3rd) groove position. Raising the clip leans the mixture; lowering it richens it.
Features
- 38mm stainless steel adjustable needle jet with tapered tip for precise fuel metering
- 5 adjustment grooves for fine-tuning air/fuel mixture — raise clip to lean, lower to richen
- C-clip included, pre-installed in middle (3rd) groove position
- Fits QMB139 / 139QMB 50cc 4-stroke carburetors and all QM/FM engine code variants
- Direct replacement for worn or damaged OEM needle jet
Specifications
- Length: 38mm
- Clip Positions: 5 grooves
- Includes: C-clip (pre-installed, middle position)
- Material: Stainless steel
- Engine: QMB139 / 139QMB 50cc 4-stroke
Engine Compatibility
Fits QMB139-based 50cc / 80cc engines with the following engine codes:
| 139QMA |
139QMB |
1P39QMB |
1P39QMA-2 |
| YN139QMB |
JJ1P39QMB |
139FMA-2 |
BD1P39QMB |
| BN139QMB |
147QMD |
Other QMA models |
Other QMB models |
Don’t see your engine listed? If the engine code includes “QM” or “FM”, this needle jet is likely compatible with your carburetor.
California Prop 65 Warning: www.p65warnings.ca.gov
Model Fitment
QMB139 / 139QMB 50cc 4-stroke engines: 139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB, 147QMD, and other QMA/QMB variants. Any engine code containing QM or FM is likely compatible.
