Description
Cvk Main Jet (#108) for 139QMB and GY6 Scooters
The Cvk Main Jet (#108) is an important part for various scooters and mopeds equipped with 139QMB and GY6 engines. This component is compatible with nearly any CVK carburetor featuring a 5mm main jet slot. It plays an important role in optimizing engine performance and fuel delivery, making it one of the key scooter carburetors & jets for your vehicle. Proper jetting may require some experimentation, so refer to available jetting instructions for guidance.
Construction and Compatibility
This main jet is designed in the Keihin round-style and features a thread size of M5x0.80, ensuring a secure fit in your carburetor. Its overall length measures 8mm. The Cvk Main Jet is compatible with a wide range of 50cc, 80cc, 125cc, 150cc, and 169cc engines identified by specific engine codes.
When to Replace Your Main Jet
Main jets should be replaced when experiencing performance issues or when adjusting the fuel-air mixture is necessary to improve engine output. Regular checks can help identify if a new jet is needed, particularly during modifications or upgrades to your scooter.
Specifications
- Type: Keihin round-style main jet
- Thread Size: M5x0.80
- Overall Length: 8mm
Fitment
This main jet fits various engines based on the 139QMB and 157QMJ models.
- 139QMB-based engines: 139QMA, 1P39QMB, 1P39QMA-2
- YN139QMB engines: JJ1P39QMB, 139FMA-2, BD1P39QMB
- BN139QMB engines: 147QMD, other QMA models, other QMB models
- 157QMJ-based engines: 161QMK, 152QMI, 1P61QMK
- YN1P57QMJ engines: 1P52FMI, 154FMI, JJ157QMJ
- 1P57QMJ engines: BN157QMJ, BN161QMK-A, other QMJ, QMK, and QMI models
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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