Cvk Main Jet (# 155) for Scooters & Mopeds

Cvk Main Jet #155 for 139QMB and GY6 Scooters

This Cvk Main Jet #155 is made for 139QMB and GY6 engines and works with most CVK carburetors that have a 5mm main jet slot. It lets you fine-tune the fuel mixture, which helps with efficiency and performance on your scooter. You can browse our range of carburetor parts and jets to find related components. Expect to test a few settings before you settle on the jetting that suits your riding.

Compatibility Overview

This main jet works with a broad range of engines, from 50cc up to 150cc. It is most often used in scooters and mopeds running 139QMB and 157QMJ engines. To confirm fit, make sure your engine code starts with "QM" or "FM".

Specifications

• Type: Keihin round-style main jet
• Thread Size: M5x0.80
• Overall Length: 8mm
• Fits: 139QMB-based 50cc/80cc GY6 engines and 157QMJ-based 125cc/150cc/169cc engines with 5mm main jet slot CVK

Fitment

Fits:

• 139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB, 147QMD engines (50cc/80cc)
• Other QMA and QMB models (50cc/80cc)
• 157QMJ, 161QMK, 152QMI, 1P61QMK, YN1P57QMJ, 1P52FMI, 154FMI, JJ157QMJ, 1P57QMJ, BN157QMJ, BN161QMK-A engines (125cc/150cc/169cc)
• Other QMJ, QMK and QMI models (125cc/150cc/169cc)

How to choose: Check that the 5mm main jet slot on your CVK carburetor matches, and confirm the engine code on your engine. Any CVK carburetor with that slot will take this main jet.

Shop more: Scooter Carburetors & Jets · Scooter Parts