Description
Cvk Main Jet #145 for GY6 and 139QMB Scooters
The Cvk Main Jet (#145) is specifically designed for 139QMB and GY6 scooters and mopeds, fitting into carburetors that accept a 5mm main jet. This jet plays an important role in optimizing your scooter's performance and tuning its fuel system. It is one of the key scooter carburetors & jets that can improve engine efficiency. Achieving the perfect jetting may involve some trial and error, so patience is key during the tuning process.
Construction and Compatibility
This main jet features a Keihin round-style design with a thread size of M5x0.80. Its overall length is 8mm, making it suitable for a wide range of engines. If your engine's identifier has "QM" or "FM" and operates with a carburetor designed for a 5mm main jet, this part is likely compatible with your setup.
When to Replace Your Main Jet
Consider replacing the main jet if you experience irregular engine behavior, such as sluggish acceleration or unstable idling. Adjusting the jetting can significantly affect the fuel-air mixture, leading to improved engine response and efficiency. Consult jetting instructions for guidance on achieving the best settings for your specific needs.
Specifications
- Material: Keihin round-style
- 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. Below are some compatible engine codes:
- 139QMA
- 1P39QMB
- 1P61QMK
- 161QMK
- 1P52FMI
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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