Cvk Main Jet (# 102) for Scooters & Mopeds

Cvk Main Jet (#102) for 139QMB and GY6 Scooters

This CVK main jet (#102) is built for 139QMB and GY6 scooters and mopeds, offering a dependable option for riders who want to refine their vehicle's performance. It is intended to regulate fuel flow and help the engine run more efficiently. Among our carburetor and jet selection, it installs without trouble in a range of models that use a 5mm jet opening on CVK carburetors. If you plan to adjust your carburetion setup, this jet is a sound choice.

Compatibility with Engine Codes

This main jet is made for engines from 50cc up to 150cc, especially those whose identifiers begin with 139QMB or 157QMJ. It serves as a straightforward replacement or upgrade for the original jet. If your engine code includes "QM" or "FM" and your carburetor has a 5mm jet opening, this part should match your setup.

Specifications

• Type: Keihin round-style main jet
• Thread Size: M5x0.80
• Overall Length: 8mm
• Fits: 139QMB-based 50cc/80cc engines and 157QMJ-based 125cc/150cc/169cc engines with 5mm main jet slot CVK

Fitment

Fits:

• 139QMB-based 50cc/80cc engines (codes: 139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB, 147QMD, other QMA and QMB models)
• 157QMJ-based 125cc/150cc/169cc engines (codes: 157QMJ, 161QMK, 152QMI, 1P61QMK, YN1P57QMJ, 1P52FMI, 154FMI, JJ157QMJ, 1P57QMJ, BN157QMJ, BN161QMK-A, other QMJ, QMK and QMI models)
• Other engines with codes including QM or FM, using a 5mm main jet slot CVK carburetor

How to choose: Only use it in a CVK carburetor that has a 5mm main jet slot, with M5x0.80 thread and an 8mm overall length.

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