Cvk Main Jet (# 136) for Scooters & Mopeds

Main Jet (#136) for 139QMB and GY6 Scooters

This main jet is made for 139QMB and GY6 scooters and serves as a useful part for adjusting engine tuning. It works with a range of vehicles that use a 5mm jet opening in a CVK carburetor. Finding the optimal setting may take some trial and error. You can browse more carburetor and jet options to help keep fuel flow working efficiently.

Performance Specifications

This jet is a Keihin round-style main jet measuring 8mm overall, with an M5x0.80 thread. It is built to a solid quality standard and is a dependable choice for getting the most from your scooter. Choose the jet size that matches your engine's requirements.

Compatibility Overview

This main jet suits a variety of engines in the 50cc, 125cc, 150cc, and 169cc range. If your engine code includes "QM" or "FM" and uses a 5mm jet opening in a CVK carburetor, this jet should also be a match. Its fit across several models makes it a versatile option.

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 a 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 (50cc/80cc)
• 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 (125cc/150cc/169cc)

How to choose: Use it on any engine with a 5mm main jet slot in a CVK carburetor, and select the jet size that suits your engine's tuning needs.

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