Description
5mm Main Jet Kit for GY6 and CN250 CVK Carburetors
This 5mm main jet kit is designed for GY6 and CN250 CVK carburetors, featuring ten different jet sizes: #100, #105, #108, #110, #113, #115, #120, #125, #130, and #140. It is important to ensure proper jetting for your engine’s performance, as it can significantly affect fuel delivery and efficiency. This kit is one of the necessary components for tuning scooter carburetors & jets. For best results, refer to available guides on jetting for specific advice.
Construction Details
The jets in this kit are made in the Keihin round style, ensuring a reliable fit and function. Each jet is manufactured with precision to facilitate accurate fuel flow adjustments. The thread size measures M5x0.80, and each jet has a total length of 8mm, making them easy to install into compatible carburetors.
When to Upgrade Your Jets
Replacing the main jets is necessary when modifying your engine or if you're experiencing performance issues. Changes in air intake, exhaust, or other performance upgrades may require different jet sizes to ensure that the engine runs smoothly and efficiently. Regularly assess your scooter's performance to determine if jet replacement is needed.
Specifications
- Thread Size: M5x0.80
- Overall Length: 8mm
- Jet Sizes: #100, #105, #108, #110, #113, #115, #120, #125, #130, #140
Fitment
This main jet kit is compatible with 157QMJ-based engines, including various models such as:
- 157QMJ
- 161QMK
- 152QMI
- 1P61QMK
- YN1P57QMJ
- 1P52FMI
- 154FMI
- JJ157QMJ
- 1P57QMJ
- BN157QMJ
- BN161QMK-A
If your engine code features "QM" or "FM" and operates with a CVK carburetor, this kit is likely suitable for your vehicle.
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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