Description
Cvk Main Jet (#138) for 139QMB and GY6 Scooters
The Cvk Main Jet (#138) is a precision component designed for scooters and mopeds equipped with 139QMB and GY6 engines. This replacement part is important for ensuring proper fuel delivery and improving engine performance. It is one of the scooter carburetors & jets that play a significant role in the bike's operation. The main jet is compatible with various CVK carburetors that accept a 5mm main jet.
Jet Specifications
This main jet features a Keihin round-style design, known for its reliability in performance applications. With a thread size of M5x0.80 and an overall length of 8mm, it fits within the designated carburetor slot. Adjusting the jetting may require some trial and error to achieve the best performance for your specific setup.
When to Replace Your Main Jet
Replace your main jet if you notice poor throttle response, inconsistent idle, or if you have made modifications to your engine that may affect fuel flow. Regular maintenance and appropriate jetting can help keep your scooter running smoothly and efficiently.
Specifications
- Type: Main Jet
- Thread Size: M5x0.80
- Overall Length: 8mm
Fitment
This main jet is suitable for 139QMB-based 50cc / 80cc engines and 157QMJ-based 125cc / 150cc / 169cc engines. If your engine code contains "QM" or "FM" and you are using a CVK carburetor that accommodates a 5mm main jet, it will likely be compatible.
- 139QMB
- GY6
- 157QMJ
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: Scooter Carburetors & Jets · Scooter Parts
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