Description
Cvk Main Jet (#135) for 139QMB and GY6 Scooters
The Cvk Main Jet (#135) is specifically designed for 139QMB and GY6 scooters, fitting a wide array of CVK carburetors that accommodate a 5mm main jet. This part is important for optimizing fuel delivery, improving engine performance and overall functionality. It is one of the key components among scooter carburetors & jets, making it significant for achieving the best riding experience. Proper jetting may require some adjustments, so consult available guides for detailed instructions on how to achieve the right setup.
Construction and Compatibility
This main jet features a Keihin round-style design with a precise M5x0.80 thread size. Its overall length measures 8mm, ensuring a secure fit in compatible carburetors. The jet is suitable for various engine codes, making it versatile for several models in the scooter market.
When to Replace
Consider replacing this main jet if you experience performance issues, such as lackluster acceleration or erratic engine behavior. If modifications have been made to your scooter or moped, adjusting the jetting may also be necessary to maintain peak performance levels.
Specifications
- Type: Main Jet
- Thread Size: M5x0.80
- Overall Length: 8mm
Fitment
This main jet is compatible with 139QMB-based 50cc / 80cc engines and 157QMJ-based 125cc / 150cc / 169cc engines. It fits various models with engine codes that contain "QM" or "FM" and use a carburetor designed for a 5mm main jet.
- 139QMB: 139QMA; 1P39QMB; 1P39QMA-2
- YN139QMB: JJ1P39QMB; 139FMA-2; BD1P39QMB
- 157QMJ: 161QMK; 152QMI; 1P61QMK
Not sure it fits? Contact us with your scooter's make, model and year and we'll confirm the fit before you order.
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