Description
Adjustable Needle Jet for QMB139 50cc 4-Stroke Scooters
This Adjustable Needle Jet is designed for the QMB139 50cc 4-stroke scooter, providing a reliable solution for replacing worn or damaged components. It features a stainless steel construction, ensuring longevity and effective performance. As one of the key GY6 50cc scooter parts, it allows for precise adjustments to the air/fuel mixture, improving your scooter's efficiency. Whether you're tuning your scooter for better performance or conducting routine maintenance, this part is a smart choice.
Construction and Functionality
Made from stainless steel, this needle jet includes a tapered tip and cylindrical body, designed to facilitate smooth airflow and fuel delivery. The five adjustment grooves enable fine-tuning across the throttle range, making it easier to achieve the desired air/fuel mixture. The C-clip comes pre-installed in the middle groove position, allowing quick adjustments to lean or enrich the mixture.
When to Replace Your Needle Jet
Replacing the needle jet is advisable when you notice performance issues such as poor acceleration, inconsistent idling, or reduced fuel efficiency. Regular maintenance checks can help identify when this part needs attention, especially if you observe wear or damage. Keeping this component in good condition is important for your scooter's overall performance.
Specifications
- Material: Stainless steel
- Length: 38mm
- Clip Positions: 5 grooves
- Position: C-clip (pre-installed, middle position)
Fitment
This needle jet is compatible with QMB139-based 50cc and 80cc engines. It fits various engine codes including:
- 139QMA
- 139QMB
- 1P39QMB
- 1P39QMA-2
- YN139QMB
- JJ1P39QMB
- 139FMA-2
- BD1P39QMB
- BN139QMB
- 147QMD
Not sure it fits? Contact us with your scooter's make, model and year and we'll confirm the fit before you order.
Shop more: GY6 50cc Scooter Parts (139QMB) · GY6 Scooter Parts · Scooter Carburetors & Jets · Scooter Bolts, Screws & Hardware · Scooter Parts
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